Add usage to readme

README.md

@@ -1,7 +1,20 @@
 # RustPython
-A Python Interpreter written in Rust
+A Python Interpreter written in Rust :snake: :scream: :metal:.
+
+# Usage
+
+To test RustPython, do the following:
+
+    git clone https://github.com/RustPython/RustPython
+    cd RustPython
+    cargo run my_script.py
+
+Or use pip to install extra modules:
+
+    cargo run -m pip install requests
 
 # Code organization
+
 The files in the top level directory are from [windelbouwman/rspython][rspython] which contains an implementation of the parser and vm in `src/`
 
 An alternative implementation of python virtual machine that are compatible with CPython parser are from [shinglyu/RustPython][rustpython] and is located in the `VM/` folder.