readme增加说明

README.md

@@ -1,2 +1,17 @@
 # node
 
+Node.js is an open-source, cross-platform JavaScript runtime environment.
+
+
+## Develop
+
+需要python，vs环境，然后执行：
+
+```
+git clone https://github.com/nodejs/node
+
+# build in windows
+choco install nasm
+npx envinfo
+./vcbuild.bat
+```