Add an install-from-source section

README.md

@@ -3,11 +3,10 @@
 > **NOTE:** \
 > This extension is from [@deanoemcke](https://github.com/deanoemcke); this repo is just a fork. \
 > The description below is borrowed from the Chrome Web Store description.
->
+
 > **TODO** — add more sections
-> - [ ] Install as an extension from source
 > - [ ] Build from github
-> - [ ] License (curren
+> - [ ] License (currently unspecified)
 > - [ ] Shoutouts
 
 ### A Chrome extension for Intuitive tab management
@@ -34,3 +33,14 @@ Isn't this essentially just bookmarks with folders? Yeah, pretty much - but who
 
 Spaces is also [available via the official Chrome Web Store](https://chrome.google.com/webstore/detail/spaces/cenkmofngpohdnkbjdpilgpmbiiljjim).
 
+Please note that the webstore version may be significantly behind the latest version here.
+
+### Install as an extension from source
+
+1. Download the **[latest available version](https://github.com/jmason888/spaces/archive/master.zip)** 
+2. Unarchive to your preferred location (e.g., `Downloads`).
+2. In **Google Chrome**, navigate to [chrome://extensions/](chrome://extensions/) and enable <kbd>Developer mode</kbd> in the upper right corner.
+3. Click on the <kbd>LOAD UNPACKED</kbd> button.
+4. Browse to the _root directory_ of the unarchived download, and click <kbd>CONFIRM</kbd>.
+
+> **TODO** &mdash; Update the download URL in step 1