Added installation process to README

Author: Prozilla

README.md

@@ -23,6 +23,35 @@ ProzillaOS is a web-based operating system inspired by Ubuntu Linux and Windows.
 	<br />
 </div>
 
+## Getting started
+
+Make sure you have [NodeJS](https://nodejs.org/en) (version v18.12 or higher) installed on your device.
+
+1. Clone the GitHub repository.
+
+	```
+	git clone https://github.com/prozilla-os/ProzillaOS.git ProzillaOS
+	cd ProzillaOS
+	```
+
+2. Install package manager and dependencies
+
+	```
+	npm i pnpm -g
+	pnpm i
+	```
+
+3. Run project
+
+	```
+	pnpm start
+	```
+
+4. Test local dev server by visiting [localhost:3000](http://localhost:3000/)
+
+> [!TIP] 
+> If you encounter an error saying `module not found`, that probably means you haven't built the packages yet. In most cases, you can fix this by typing `pnpm run packages:build`.
+
 ## Packages
 
 ### Libraries (public)
@@ -140,4 +169,4 @@ ProzillaOS is [MIT licensed](./LICENSE).
 [browser]: ./packages/apps/browser/
 [calculator]: ./packages/apps/calculator/
 [logic-sim]: ./packages/apps/logic-sim/
-[license]: ./LICENSE
+[license]: ./LICENSE