readme: update

README.md

@@ -1,5 +1,18 @@
 # Bing AI in ~~Edge~~ any browser
+This extension just opens Bing AI (the kind available in the Edge sidebar) in an extension popup.
 
 ## Requirements
-1. A Chromium-based browser *(Chrome, Arc, Vivaldi, etc)*
-2. 
+  - A Chromium-based browser *(Chrome, Arc, Vivaldi, etc)*
+  - A Microsoft account
+
+## Installation
+  - [Download this repository](https://github.com/akshay7394/bing-everywhere/archive/refs/heads/main.zip) (or clone it)
+  - Extract it somewhere (temporarily, you can delete this folder afterwards)
+  - Copy this:
+      ```
+      about:extensions
+      ```
+  - Paste it in your address bar & hit Enter
+  - Turn on "Developer Mode" (the toggle's at the top-right corner of this page)
+  - Click on "Load unpacked extension" 
+  - Navigate to the directory where you extracted the .zip file to