UserTracker changes

* Added README.md
* Added .gitignore

Change-Id: Ifac6f85fa48fb150cb3778e0d12c5ece8ba03070

usertracker/.gitignore

+__pycache__

usertracker/README.md

+# GitMonitor.sh
+
+Python tooling to monitor certain activities within Gerrit and Phabricator.  See ```./bin/GerritTracker -h``` or ```./bin/PhabricatorTracker -h``` for command-line arguments.
+
+## Prerequisites
+
+```
+Python 3 stdlib
+argparse
+datetime
+json
+os
+re
+requests
+smtplib
+socket
+sys
+syslog
+time
+```
+
+## Installing
+
+1. ```git clone https://gerrit.wikimedia.org/r/wikimedia/security/tooling```
+
+## Options
+
+Command-line options to pass.  Most are required.
+
+# ```-h, --help``` - show this help message and exit
+# ```-e EMAILS, --emails EMAILS``` - email or comma-separated list of emails to notify
+# ```-d EMAILDEBUG, --emaildebug EMAILDEBUG``` - email debug flag (True or False)
+# ```-t TIMEINTERVAL, --timeinterval TIMEINTERVAL``` - time interval (e.g. 1d, 2m, etc - see process_time_interval)
+# ```-u GUSERNAME, --gusername GUSERNAME``` - gerrit username to track
+# ```-i GUSERID, --guserid GUSERID``` - gerrit user id to track (corresponds to --gusername)
+
+## Usage
+
+1. Simply run the appropriate tracker in ```/bin``` with the above options specified.  e.g.
+
+```./bin/GerritTracker -e test@example.com -t 1d -u nobody -i 1111```
+
+**OR**
+
+2. Set up as a cron (e.g. every 2 minutes):
+
+```*/2 * * * * ./bin/GerritTracker -e test@example.com -t 1d -u nobody -i 1111```
+
+## Known Issues
+
+# See TODOs in ```UserTracker.py```
+
+## Authors
+
+* **Scott Bassett** [sbassett@wikimedia.org]
+
+## License
+
+This project is licensed under the Apache 2.0 License - see the [LICENSE](https://opensource.org/licenses/Apache-2.0) file for details.