Update README

README.md

@@ -1,5 +1,37 @@
 # Redmine Issue Notes On Context Menu
-This is a plugin for Redmine. 
+This is a plugin for Redmine.  
+This plugin adds a menu item to the existing context menu to display the issue notes dialog.  
+The dialog has `edit`, `delete` and `add` capabilities.  
+
+## Images
+### View mode
+![View mode](doc/view_mode.png)
+
+### Edit mode
+![Edit mode](doc/edit_mode.png)
+
+## Supported Redmine Versions
+Only Redmine `5.0.5` has been checked. Other versions have not been checked.
+
+## Installation
+### When using git
+
+1. Clone this repository to your Redmine plugins directory.
+     ```
+     cd [YOUR_REDMINE_DIRECTORY]/plugins
+     git clone https://github.com/sk-ys/redmine_issue_notes_on_context_menu.git
+     ```
+
+2. Restart Redmine.
+
+### When not using git
+
+1. Download zip file from the [release page](https://github.com/sk-ys/redmine_issue_notes_on_context_menu/releases) or the [latest main repository](https://github.com/sk-ys/redmine_issue_notes_on_context_menu/archive/refs/heads/main.zip).
+
+2. Extract the ZIP file to your Redmine plugins directory. The name of the unzipped directory must be `redmine_issue_notes_on_context_menu`.
+
+3. Restart Redmine.
+
 
 ## Using Libraries
 ### Google Material Symbols