Added git clone plugin

Dockerfile

@@ -0,0 +1,6 @@
+FROM alpine/git
+
+COPY clone.sh /usr/local/bin/
+RUN chmod +x /usr/local/bin/clone.sh
+
+ENTRYPOINT [ "/usr/local/bin/clone.sh" ]

README.md

@@ -1,2 +1,27 @@
 # git-plugin
-A custom git plugin to clone a repository and prints the last commit.
+A custom git plugin to clone a public git repository and prints the last commit.
+
+# Running it as part of CIE pipeline
+```console
+- step:
+    identifier: clone
+    name: clone
+    type: Plugin
+    spec:
+        image: "shubham149/git-plugin"
+        settings:
+            path: codebase
+            repo_url: https://github.com/shubham149/git-plugin.git
+            branch: main
+```
+
+# Run it locally
+This clones a git repo inside codebase folder.
+
+```console
+docker run --rm \
+  -e PLUGIN_PATH=codebase \
+  -e PLUGIN_REPO_URL=https://github.com/shubham149/git-plugin.git \
+  -e PLUGIN_BRANCH=main \
+  shubham149/git-plugin
+```

clone.sh

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+#!/bin/sh
+set -xe
+
+# If path setting is not set, then use current directory
+path=${PLUGIN_PATH:-.}
+mkdir -p ${path}
+cd ${path}
+
+# Clones the public git repo and checkout to a branch
+git clone ${PLUGIN_REPO_URL} .
+git checkout ${PLUGIN_BRANCH}
+
+# Prints the last commit
+git log -1 --stat