Add devcontainer

Signed-off-by: Kotaro Inoue <k.musaino@gmail.com>

.devcontainer/Dockerfile

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+ARG VARIANT="bullseye"
+FROM mcr.microsoft.com/vscode/devcontainers/rust:1-${VARIANT}
+
+RUN apt-get update
+
+# For building
+RUN apt-get install -y \
+  git \
+  pkg-config \
+  libsystemd-dev \
+  build-essential \
+  libelf-dev \
+  libseccomp-dev \
+  libclang-dev \
+  libssl-dev
+
+RUN curl https://sh.rustup.rs -sSf | sh -s -- -y 
+RUN rustup component add rustfmt
+RUN rustup component add clippy 

.devcontainer/devcontainer.json

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+{
+	"name": "oci-spec-rs",
+	"customizations": {
+		"vscode": {
+			"settings": {
+				"lldb.executable": "/usr/bin/lldb",
+				"files.watcherExclude": {
+					"**/target/**": true
+				},
+				"rust-analyzer.checkOnSave.command": "clippy"
+			},
+			"extensions": [
+				"vadimcn.vscode-lldb",
+				"mutantdino.resourcemonitor",
+				"rust-lang.rust-analyzer",
+				"tamasfe.even-better-toml",
+				"serayuzgur.crates"
+			]
+		}
+	},
+	"build": {
+		"dockerfile": "Dockerfile"
+	}
+}