Create page about initial steps needed after using the template

[finsberg]

We currently have a lot of nice templates but we should add a recipe for what do to once you have created a new repository with that template. For example

1. Click on the Use this template button - specify the name of the repo, add a description and decide whether to make it public or private. If you make it private you can make it public later
2. Remove these files...
3. Change these files
4. Enable github pages ...
5. Etc

[jorgensd]

I would recommend using our cookiecutters rather than the template functionality, but if you add it I wont object.