Added Readme

README.md

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+# cleanupGoneBranches
+
+A small command-line utility written in Go that helps you clean up **local Git branches whose remote counterparts have already been deleted** ("gone" branches).
+
+Instead of manually finding and deleting stale branches, this tool:
+
+- Fetches and prunes your remote references
+- Detects local branches whose upstream no longer exists
+- Lets you interactively select which branches to delete
+- Protects your current branch from accidental deletion
+- Supports automatic cleanup and forced deletion
+
+## Features
+
+- ✅ Runs `git fetch --prune`
+- ✅ Detects local branches with deleted remotes
+- ✅ Interactive branch selection
+- ✅ Range selection (`1,3-5`)
+- ✅ Select all (`all`)
+- ✅ Confirmation before deleting
+- ✅ Never deletes the currently checked-out branch
+- ✅ Optional forced deletion (`git branch -D`)
+- ✅ Show-only mode
+- ✅ Display equivalent manual Git commands
+
+---
+
+## Installation
+
+### Build from source
+
+```bash
+git clone <repository>
+cd cleanupGoneBranches
+
+go build -o cleanupGoneBranches
+```
+
+Or install directly:
+
+```bash
+go install
+```
+
+---
+
+## Usage
+
+```bash
+cleanupGoneBranches [options]
+```
+
+### Options
+
+| Option | Description |
+|---------|-------------|
+| `--show` | Show gone branches only (don't delete anything) |
+| `--all` | Select all gone branches automatically (still asks for confirmation) |
+| `--force` | Use `git branch -D` instead of `git branch -d` |
+| `--info` | Show the equivalent manual Git commands |
+| `-h`, `--help` | Show help |
+
+---
+
+## Example
+
+```
+$ cleanupGoneBranches
+
+Git fetch mit prune...
+
+Gefundene lokale Branches mit gelöschtem Remote (gone):
+
+  1) feature/login
+  2) bugfix/navbar
+  3) old-experiment
+
+Auswahl eingeben, z.B. 1,3-5 oder all. Leer lassen zum Abbrechen.
+
+Auswahl: 1,3
+
+Es werden diese Branches gelöscht:
+
+  - feature/login
+  - old-experiment
+
+Wirklich löschen? (y/N): y
+
+Lösche Branches...
+
+Deleted branch feature/login
+Deleted branch old-experiment
+
+Fertig.
+```
+
+---
+
+## Selection Syntax
+
+You can select branches using:
+
+| Input | Meaning |
+|--------|---------|
+| `1` | Delete branch #1 |
+| `1,4,7` | Delete branches 1, 4, and 7 |
+| `2-5` | Delete branches 2 through 5 |
+| `1,3-6` | Mixed selection |
+| `all` | Select every gone branch |
+
+Leaving the prompt empty cancels the operation.
+
+---
+
+## Safe by Default
+
+By default the tool uses:
+
+```bash
+git branch -d
+```
+
+which only deletes branches that Git considers safely merged.
+
+If you want to force deletion, use:
+
+```bash
+cleanupGoneBranches --force
+```
+
+which uses:
+
+```bash
+git branch -D
+```
+
+---
+
+## Show Gone Branches Only
+
+```bash
+cleanupGoneBranches --show
+```
+
+Useful if you just want to inspect stale branches.
+
+---
+
+## Delete Everything
+
+```bash
+cleanupGoneBranches --all
+```
+
+All gone branches are selected automatically, but you'll still be asked for confirmation before deletion.
+
+---
+
+## Manual Git Equivalent
+
+Run:
+
+```bash
+cleanupGoneBranches --info
+```
+
+to display the Git commands that perform the same operations manually.
+
+---
+
+## Requirements
+
+- Go 1.20+ (for building)
+- Git installed and available in your `PATH`
+- Must be executed inside a Git repository
+
+---
+
+## Notes
+
+- The currently checked-out branch is never deleted.
+- The tool automatically runs `git fetch --prune` before searching for gone branches.
+- Branches are always sorted alphabetically.
+- A confirmation prompt is shown before any deletion occurs.
+