new(contributing): Added contributing.md file

CONTRIBUTING.md

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+# How to Contribute to KubeArmor-Client?
+
+1. Pick an [issue](https://github.com/kubearmor/kubearmor-client/issues) to work on. For first-time contributors, the best would be to pick an issue [tagged good-first-issue](https://github.com/kubearmor/kubearmor-client/labels/good%20first%20issue).
+
+2. If you feel adventurous and would like to take a challenging issue, we would love to have you contribute on issues [tagged help-wanted](https://github.com/kubearmor/kubearmor-client/labels/help%20wanted).
+
+3. There is a [Contribution Guide](https://github.com/kubearmor/KubeArmor/blob/main/contribution/contribution_guide.md) that explains how to create a fork and raise PR on GitHub.
+
+4. If the issue involves code changes you need to install development env using this [Development Guide](https://github.com/kubearmor/KubeArmor/blob/main/contribution/development_guide.md).
+
+# Scope of Contribution
+
+Contributions are not necessarily in the form of code changes. KubeArmor community can benefit from contributions such as:
+
+1. [Policy-Templates](https://github.com/kubearmor/policy-templates)
+
+   Users are welcome to contribute policy-templates for their workloads. The workloads have to be generic enough such that it benefits the wider community. E.g., if someone brings up a system policy restricting access to nginx process that would be useful in multiple scenarios and for the wider community then come up with a policy-template that is specific to your proprietary application.
+
+2. Blogs
+
+   a. Explain The use of KubeArmor-Client's features (KVMService, Event Auditor, Visibility, etc)
+
+   b. Describe How to use KubeArmor-Client to protect your workload with specific use-cases you may have. Please do not shy away from getting as technical as you can.
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+   c. Put your topic of interest
+
+3. Feedback to the community
+
+   Just helping advance any discussion on KubeArmor Slack, Community meetings, office hours will make a big difference.
+
+4. Talking about KubeArmor-Client in meetups
+
+   We would certainly encourage users or devs of KubeArmor to talk about it in open/closed forums. The community can help with logistics such as compiling/feedback on slide-decks, technical diagrams, etc.