diff --git a/.github/workflows/build_wheel.yml b/.github/workflows/build_wheel.yml
index dd3795420..35b7f75b4 100644
--- a/.github/workflows/build_wheel.yml
+++ b/.github/workflows/build_wheel.yml
@@ -29,7 +29,7 @@ jobs:
       with:
         python-version: ${{ matrix.python-version }}
 
-    - name: install dependencies
+    - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
         pip install wheel twine
@@ -42,12 +42,12 @@ jobs:
       run: |
         cython ./maro/backends/backend.pyx ./maro/backends/np_backend.pyx ./maro/backends/raw_backend.pyx ./maro/backends/frame.pyx -3 -E FRAME_BACKEND=NUMPY,NODES_MEMORY_LAYOUT=ONE_BLOCK -X embedsignature=True
 
-    - name: build wheel on Windows and macOS
+    - name: Build wheel on Windows and macOS
       if: runner.os == 'Windows' || runner.os == 'macOS'
       run: |
         python setup.py bdist_wheel
 
-    - name: build manylinux wheel
+    - name: Build manylinux wheel
       if: runner.os == 'Linux' && matrix.python-version == '3.6'
       uses: RalfG/python-wheels-manylinux-build@v0.3.1-manylinux2010_x86_64
       with:
@@ -55,13 +55,13 @@ jobs:
         build-requirements: 'numpy'
         pip-wheel-args: '-w ./wheelhouse' # save wheel packages to wheelhouse folder
     
-    - name: move valid packages to dist folder for manylinux
+    - name: Move valid packages to dist folder for manylinux
       if: runner.os == 'Linux' && matrix.python-version == '3.6'
       run: |
         mkdir -p dist
         cp wheelhouse/maro-*-manylinux*.whl dist
 
-    - name: build source package on linux
+    - name: Build source package on linux
       if: runner.os == 'Linux' && matrix.python-version == '3.6'
       run: |
         python setup.py sdist 
diff --git a/.github/workflows/deploy_docker_image.yml b/.github/workflows/deploy_docker_image.yml
index a98f89495..6052457a3 100644
--- a/.github/workflows/deploy_docker_image.yml
+++ b/.github/workflows/deploy_docker_image.yml
@@ -25,30 +25,23 @@ jobs:
 
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
-      # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
-      - uses: actions/checkout@v2
+    # Checks-out your repository under $GITHUB_WORKSPACE, so your job can access it
+    - uses: actions/checkout@v2
+    - name: Set up Python 3.6
+      uses: actions/setup-python@v2
+      with:
+        python-version: 3.6
 
-      - name: Build and push Docker images
-        # You may pin to the exact commit or the version.
-        # uses: docker/build-push-action@ab83648e2e224cfeeab899e23b639660765c3a89
-        uses: docker/build-push-action@v1.1.1
-        with:
-          # Username used to log in to a Docker registry. If not set then no login will occur
-          username: ${{ secrets.DOCKER_HUB_USERNAME }}
-          # Password or personal access token used to log in to a Docker registry. If not set then no login will occur
-          password: ${{ secrets.DOCKER_HUB_PASSWORD }}
-          # Server address of Docker registry. If not set then will default to Docker Hub
-          registry: https://hub.docker.com/repository/docker/arthursjiang/maro
-          # Docker repository to tag the image with
-          repository: latest
-          # Comma-delimited list of tags. These will be added to the registry/repository to form the image's tags
-          tags: citi-bike, inventory-management, operations-research, reinforcement-learning, resource-optimization, simulator
-          # Automatically tags the built image with the git reference as per the readme
-          # Path to the build context
-          path: .
-          # Path to the Dockerfile (Default is '{path}/Dockerfile')
-          dockerfile: docker_files/cpu.play.df
-          # Sets the target stage to build
-          target: maro/playground:cpu
-          # Whether to push the image
-          push: true
+    - name: Build image
+      run: |
+        pip install -r ./maro/requirements.build.txt
+        cython ./maro/backends/backend.pyx ./maro/backends/np_backend.pyx ./maro/backends/raw_backend.pyx ./maro/backends/frame.pyx -3 -E FRAME_BACKEND=NUMPY,NODES_MEMORY_LAYOUT=ONE_BLOCK -X embedsignature=True
+        docker build -f ./docker_files/cpu.play.df . -t ${{ secrets.DOCKER_HUB_USERNAME }}/maro:cpu
+
+    - name: Login docker hub
+      run: |
+        docker login --username ${{ secrets.DOCKER_HUB_USERNAME }} --password ${{ secrets.DOCKER_HUB_PASSWORD }}
+        
+    - name: Push image
+      run: |
+        docker push ${{ secrets.DOCKER_HUB_USERNAME }}/maro
diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 100644
index 000000000..5b8e2e374
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,13 @@
+# Contributing to MARO
+
+MARO is newborn for Reinforcement learning as a Service (RaaS) in the resource optimization domain. Your contribution is precious to make RaaS come true.
+
+- [Open issues](https://github.com/microsoft/maro/issues) for reporting bugs and requesting new features.
+- Contribute to [examples](https://github.com/microsoft/maro/tree/master/examples) to share your problem modeling to others.
+- Contribute to [scenarios](https://github.com/microsoft/maro/tree/master/maro/simulator/scenarios) to provide more meaningful environments.
+- Contribute to [topologies](https://github.com/microsoft/maro/tree/master/maro/simulator/scenarios/citi_bike/topologies) to enhance existing MARO scenarios.
+- Contribute to [algorithms](https://github.com/microsoft/maro/tree/master/maro/rl/algorithms) to enrich MARO RL libraries.
+- Contribute to [orchestration](https://github.com/microsoft/maro/tree/master/maro/cli) to broad MARO supported cloud services.
+- Contribute to [communication](https://github.com/microsoft/maro/tree/master/maro/communication) to enhance MARO distributed training capacity.
+- Contribute to [tests](https://github.com/microsoft/maro/tree/master/tests) to make it more reliable and stable.
+- Contribute to [documentation](https://github.com/microsoft/maro/tree/master/maro) to make it straightforward for everyone.
\ No newline at end of file