add clarification about internet dependency for git(hub)

Author: stijnvanhoey

source/manual-git-without-internet.Rmd

@@ -0,0 +1,50 @@
+---
+title: "Working with Git without internet connection"
+author: "Stijn Van Hoey"
+date: "March 29, 2017"
+output: html_document
+---
+
+When working off line, two Git tasks cannot be performed: fetching/pulling updates from the server, and pushing changes to the server. All other commands still work.
+
+One can commit changes, branch off, revert and reset changes, the same as when there exists an internet connection.
+
+### Example workflow:
+
+**start offline mode**
+
+```
+while(notBored):
+	commit changes
+	add files
+	branch off new features
+```
+
+**end offline mode**
+
+
+*update master branch*
+
+```
+git fetch origin
+```
+
+*push changes to the server*
+
+```
+git push <branch-name>
+```
+
+*it is possible, that during your down-time, a pull request got accepted
+in that case, perform the following steps*
+
+```
+git fetch origin
+git checkout <branch-name>
+git rebase master
+```
+
+*when necessary: solve merge conflicts, and rebase again.*
+
+*Your feature branch can now be pushed to the server, and a pull request can be made*
+