add how to install

Author: justdave

README.md

@@ -22,6 +22,15 @@ access to your mail spool *directory* (not just the spool file). This is
 because of procmail-compatible file locking and temp files. Often you can do
 this by adding the bot user to the 'mail' group.
 
+## Installation
+
+To install, run:
+```
+pip3 install --user git+https://github.com/bugzilla/limnoria-bugzilla.git
+```
+
+## Bug Reports and Contributing
+
 * [Browse existing bug reports](https://bugzilla.mozilla.org/buglist.cgi?product=Bugzilla&component=Limnoria-Bugzilla%20IRC%20Bot&resolution=---)
 * [Report bugs](https://bugzilla.mozilla.org/enter_bug.cgi?product=Bugzilla&component=Limnoria-Bugzilla%20IRC%20Bot)
 * [Contribute fixes by filing a pull request](https://github.com/bugzilla/limnoria-bugzilla)