Create INSTALL.md

INSTALL.md

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+# Plugin Installation
+
+- **Install via the [Kanboard](https://github.com/kanboard/kanboard "Kanboard - Kanban Project Management Software") Plugin Directory**
+  - _Go to:_
+    - Kanboard: `Plugins` ⥂ `Plugin Directory`
+  - _or with [PluginManager](https://github.com/aljawaid/PluginManager "A Kanboard plugin") installed:_
+    - Kanboard: `Settings` ⥂ `Plugins` ⥂ `Plugin Directory`
+- **Install via the [Releases](../master/Releases/ "A copy of each release is saved in the folder") folder**
+  - A copy of each release is saved in the `/Releases` folder of the repository
+  - Simply extract the `.zip` file into the `/plugins` directory
+- **Install via [GitHub](https://github.com/ "Find the correct plugin from the list of repositories")**
+  - Download the `.zip` file and decompress everything under the directory `/plugins`
+  - The folder inside the `.zip` must not contain any branch names and must be exact case (matching the plugin name)
+
+_Note: The `/plugins` folder is case-sensitive._
+
+- **Install using Git CLI**
+  - `git clone` (_or ftp upload_) and extract the `.zip` file into this folder: `.\plugins\` (must be exact case)
+
+---
+
+Read the full [**Changelog**](../master/changelog.md "See changes") or view the [**README**](../master/README.md "View README")