feat: added cli usage

Author: raphael-goetz

README.md

@@ -0,0 +1,33 @@
+# Definition CLI
+
+## Setup
+```bash
+cargo build --release
+```
+
+## Usage
+
+### General Report
+```bash
+./cli report
+./cli report -p /path/to/definitions
+```
+
+### Feature Report
+```bash
+./cli feature
+./cli feature -f feature_name
+./cli feature -f feature_name -p /path/to/definitions
+```
+
+### Watch for Changes
+```bash
+./cli watch
+./cli watch -p /path/to/definitions
+```
+
+### Definition
+```bash
+./cli definition -n definition_name
+./cli definition -n definition_name -p /path/to/definitions
+```