Update README.md

Add installation instructions

Author: FoxKiana

README.md

@@ -1,2 +1,19 @@
 # vscode-c3
-VS Code extension for C3
+
+## Installation
+
+```bash
+git clone https://github.com/c3lang/vscode-c3.git
+cd vscode-c3
+
+npm install
+npm build
+```
+
+In vscode head over to the extensions section and click on the 3 dots. From there select "Install from VSIX ..." and select the newly created file
+
+![](https://i.imgur.com/yv9C4AI.png)
+
+## Issues and contributing
+
+If you find any issues or bugs feel free to open an issue or fix it yourself and open a Pull request.