Update README.md

Author: pmp-p

README.md

@@ -1,2 +1,38 @@
-# pygame-wasm-sdk
+# python-wasm-sdk
 Tooling for building CPython+Pygame on WebAssembly
+
+
+example building from within own pygame git clone tree on ubuntu 20.04 or linux mint :
+```bash
+#!/bin/bash
+
+# in github CI, current working dir would be /home/runner/pygame/pygame.
+
+# update system
+sudo apt-get update
+sudo apt-get install -y bash python3-pip curl pv
+
+# update cython
+pip3 install git+https://github.com/cython/cython.git --upgrade
+
+# update source tree
+git clean -f
+git pull
+
+# sdk
+sudo mkdir -p /opt/python-wasm-sdk && sudo chown $(whoami) /opt/python-wasm-sdk
+curl -sL --retry 5 https://github.com/pygame-web/python-wasm-sdk/releases/download/0.1.0/python-wasm-sdk-stable.tar.bz2 \
+ | tar xvPj \
+ | pv -f -c -p -l -s 20626 >/dev/null
+
+# build pygame
+touch $(find |grep pxd$)
+python3 setup.py config cython
+
+/opt/python-wasm-sdk/python3-wasm setup.py -config -auto -sdl2
+
+/opt/python-wasm-sdk/python3-wasm setup.py build
+
+# get static lib
+SYS_PYTHON=python3 /opt/python-wasm-sdk/emsdk/upstream/emscripten/emar rcs libpygame.a $(find build/temp.wasm32-*/|grep o$)
+```