Add Gerrit configuration section to README

Author: nikitavbv

README.md

@@ -295,6 +295,18 @@ if you want to use another path, you can change the defaults:
 
     python -m git_repo.extract_config ~/.gitconfig-repos ~/.gitconfig
 
+### Configuring Gerrit
+
+Please note: when configuration wizard will ask you for password, do not provide
+your Gerrit account password, but enter `HTTP password` instead. You can setup
+it on [Settings > HTTP Password page](https://review.gerrithub.io/#/settings/http-password)
+
+You may also need to tweak your `~/.gitconfig`:
+* set `ro-suffix` if your Gerrit isn't served at server root. For example, set
+  `ro-suffix` to `/r` if your Gerrit is hosted at `https://review.host.com/r`
+* set `ssh-port` parameter to set custom port for ssh connection to Gerrit (default: 29418)
+* set `auth-type`: basic (default) or digest
+
 ### Development
 
 For development, start a virtualenv and from within install the devel requirements: