* Preparing git by installing it and telling our name, email and setting
it to cache passwords for hour.
* Suggest git cloning with https instead of ssh as it can be easier.
* mention that ssh is also possible if the person is adanced with
git
* Fix typos
* `I already write` --> `I already wrote`.
* `Simple isn't` --> `Simple isn'it it?`
* `Go back on` --> `Go back to`
* `is)files` --> `is) files`
* remove swearing.
* Clone the `testing` branch in the beginning, don't require checkout.
* Added notice on not having to git checkout if testing was cloned.
* Rename `progval` to `upstream`
* If people are contributing to multiple projects, the remote
`upstream` is easier to remember than random nickname.
* I am Mikaela
* and I use git by myself nowadays.
