title: Joining two GIT repositories into one using SourceTree
body: <p>I have separate GIT repositories for each Arduino Project I have developed which I handle using SourceTree connected to remote repositories in Bitbucket.</p>
  
  <p>I would like to know how can I join these repositories into one and conserve the history changes of each file.</p>
  
  <p>Is it possible to do it within SourceTree? I have not used GIT by command line yet.</p>