Update 'README.md'

README.md

@@ -1,2 +1,19 @@
 # elm
 
+通过 npm 方式安装可能失败（jcenter失效），手动安装：
+
+```
+curl -L -o elm.gz https://github.com/elm/compiler/releases/download/0.19.1/binary-for-linux-64-bit.gz
+gunzip elm.gz
+chmod +x elm
+mv elm /usr/local/bin/
+
+rm /usr/local/bin/elm
+rm -r ~/.elm/
+
+```
+
+## Reference
+
+[](https://github.com/elm/compiler/)
+