Update README.md

Author: cynthi8

README.md

@@ -5,3 +5,16 @@
 Generates a C/C++ function call from the selected function signature.
 
 ![feature X](examples/example_0.gif)
+
+
+## Installation
+1. Download the latest c-cpp-function-call-generator-X.X.X.vsix file from Releases.
+2. Drag the .vsix file onto the Extensions sidebar in an open Visual Studio Code window.
+
+## Build from Source
+_Requires Node.js_
+```
+npm install –g vsce
+npm install --save-dev webpack webpack-cli
+vsce package
+```