Update readme

README.md

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-# slack-workspace-switcher-for-all
+# Slack Workspace Switcher For All
+
 This is a Chrome extension, which enables workspace switcher for browser app (similar to Chrome OS / desktop apps)
+
+The extension works by spoofing `navigator.userAgent` in a way that Slack thinks we are using ChromeOS. This triggers loading of the workspace switcher to the left sidebar.
+
+Installation:
+
+1. Clone/download contents of this repository and unzip the package if you downloaded zip.
+
+2. Enable developer mode in Chrome. Go to Settings -> Extensions -> toggle Developer mode in right top corner.
+
+3. Click "Load unpacked", find the folder where you unzipped/cloned the extension, click OK.
+
+4. Open new tab with Slack. If you are signed into multiple workspaces, icon for each workspace should be now available in left sidebar.