Add codefresh cli plugin

Author: Itai Gendler

.gitignore

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+.idea/

stable/codefresh-cli/NOTES.md

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+## Notes

stable/codefresh-cli/README.md

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+# Codefresh Cli Plugin
+
+Use Codefresh Cli plugin to perform operations on your Codefresh resources
+
+## Usage
+
+
+```yaml
+---
+version: '1.0'
+
+steps:
+
+  ...
+
+  annotate_image:
+    image: codefresh/cli
+    description: annotates image with metadata
+    command: annotate image IMAGE_ID -a key1=value1 -a key2=value2
+
+  run_pipeline:
+    image: codefresh/cli
+    description: run a pipeline
+    command: run pipeline PIPELINE_NAME REPO_OWNER REPO_NAME -b master
+  ...
+
+```
+
+## Environment Variables
+
+- `CFCONFIG` - Path for cfconfig file path (default: ${HOME}/.cfconfig

stable/codefresh-cli/plugin.yaml

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+image: codefresh/cli
+version: 0.1.0
+description: Operate on Codefresh resources
+keywords:
+  - cli
+home: https://github.com/codefresh-io/codefresh
+sources:
+  - https://github.com/codefresh-io/codefresh
+icon: http://cdn.osxdaily.com/wp-content/uploads/2014/08/terminal-icon-osx.png
+envs:
+  - name: CFCONFIG
+    description: Path for cfconfig file path