sdk-py: Add tldr in Readme.

src/sdk/python/README.md

@@ -1,3 +1,11 @@
 # Installation
 
 Follow virtualenv and pyo3 setup guide: https://pyo3.rs/v0.15.1/#using-rust-from-python
+
+## tldr
+
+```
+$ python3 -m venv venv
+$ source venv/bin/activate
+$ maturin develop --release
+```