Implements jeaddons CLI tool

Adds a CLI tool to copy files or folders from a git repository into the current project based on a registry.

The tool provides commands to:
- `add`: Copies files/folders based on registry entries.
- `list`: Lists available registry entries.

Registry entries are defined in `jeAddons/registry.py`.
The tool supports overriding the registry's ref and destination.

README.md

@@ -1,2 +1,39 @@
 # jeAddons
 
+Clone a file or folder from Git repositories into your current project.
+
+`add` is registry-based (like `shadcn add`): you manage entries in a dict.
+
+## Usage with uvx
+
+1. Edit `jeAddons/registry.py` and add entries to `REGISTRY`.
+2. Run:
+
+```bash
+uvx jeaddons add <name> [--ref <branch-or-tag>] [--dest <target-dir>] [--force]
+```
+
+3. See available names:
+
+```bash
+uvx jeaddons list
+```
+
+## Registry example
+
+```python
+REGISTRY = {
+    "button": {
+        "repo": "https://github.com/user/templates.git",
+        "path": "src/components/Button.tsx",
+        "ref": "main",
+        "dest": "src/components",
+    },
+    "ui": {
+        "repo": "https://github.com/user/templates.git",
+        "path": "src/components/ui",
+        "ref": "v1.2.0",
+        "dest": "src/components",
+    },
+}
+```