chore: add readme file

README.md

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+# Repo-Guard
+
+Repo-Guard is a web service built with Go that integrates with GitHub repositories to automatically manage duplicate issues. 
+It detects, closes duplicate issues, and comments with links to similar existing issues, enhancing repository management and user communication.
+
+## Features
+
+- Automatic detection and closure of duplicate issues.
+- Comments on duplicate issues with links to similar existing issues.
+- Real-time issue monitoring using GitHub webhooks.
+- Easy integration with any GitHub repository after installing the GitHub App.
+
+## Technologies Used
+
+- Go
+- Templ
+- Tailwind
+- GitHub API
+
+## Usage
+
+  - Go to the [GitHub App installation page](https://repo-guard.koyeb.app).
+  - Click **Install GitHub App** and select the repositories you want to integrate with Repo-Guard.