docs(bindings/python): Add building docs

Signed-off-by: Xuanwo <github@xuanwo.io>

bindings/python/README.md

@@ -1,3 +1,36 @@
 # OpenDAL Python Binding
 
 This crate intends to build a native python binding.
+
+## Building
+
+Install `maturin`:
+
+```shell
+pip install maturin
+```
+
+Setup virtualenv:
+
+```shell
+virtualenv venv
+```
+
+Activate venv:
+
+```shell
+source venv/bin/activate
+````
+
+Build bindings:
+
+```shell
+maturin develop
+```
+
+Running some tests:
+
+```shell
+pip install -r test_requirements.txt
+pytest
+```