add readme

Author: jm-factorin

readme.md

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+ChatWork Code Highlight! Extension
+==============================
+
+## How to install
+
+1. Clone this repository.
+
+ ```bash
+ $ git clone https://github.com/jm-factorin/chatwork-code-highlight.git
+ ```
+ 
+3. Open google chrome and go to `chrome://extensions/`
+
+4. Click `extension` link in the left sidebar
+
+5. Check the `Developer mode` checkbox on the top right side of the page
+
+6. Click the `Load unpacked extension` button and find the root directory of the cloned repository.
+
+7. The ChatWork Code Highlight! extension must be added to the list of your extension and refresh/reload your ChatWork page