GitHub Actions - template cleanup workflow

.github/template-cleanup/CHANGELOG.md

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+<!-- Keep a Changelog guide -> https://keepachangelog.com -->
+
+# %NAME% Changelog
+
+## [Unreleased]
+### Added
+- Initial scaffold created from [IntelliJ Plugin Template](https://github.com/JetBrains/intellij-plugin-template)

.github/template-cleanup/README.md

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+# %NAME%
+
+![Build](https://github.com/hsz/intellij-plugin-template/workflows/Build/badge.svg)
+
+<!-- Plugin description -->
+This Fancy IntelliJ Plugin is going to be your implementation of the brilliant ideas that you have.
+
+This specific section is a source for the [plugin.xml](./src/main/resources/META-INF/plugin.xml) file which will be
+extracted by the [Gradle](./build.gradle.kts) during the build process.
+
+To keep everything working, do not remove `<!-- ... -->` sections. 
+<!-- Plugin description end -->
+
+## Installation
+
+- Using IDE built-in plugin system:
+  
+  <kbd>Preferences</kbd> > <kbd>Plugins</kbd> > <kbd>Marketplace</kbd> > <kbd>Search for "%NAME%"</kbd> >
+  <kbd>Install Plugin</kbd>
+  
+- Manually:
+
+  Download the [latest release](https://github.com/%REPOSITORY%/releases/latest) and install it manually using
+  <kbd>Preferences</kbd> > <kbd>Plugins</kbd> > <kbd>⚙️</kbd> > <kbd>Install plugin from disk...</kbd>
+
+
+---
+Plugin based on the [IntelliJ Plugin Template](https://github.com/JetBrains/intellij-plugin-template).