added git tasks

@kpiwko 
That's not correct:
```
kpiwko@kpiwko-x220 ~ » mkdir foobar
kpiwko@kpiwko-x220 ~ » cd foobar 
kpiwko@kpiwko-x220 ~/foobar » git init
Initialized empty Git repository in /home/kpiwko/foobar/.git/
kpiwko@kpiwko-x220 ~/foobar ±master » git add /opt/apache-maven-3.1.1
fatal: '/opt/apache-maven-3.1.1' is outside repository
kpiwko@kpiwko-x220 ~/foobar ±master »                                     128 ↵
```