Merge branch 'commandline' into 'master'

added new doc "command line commands"

Added new doc to GitLab Basics

See merge request !1880

doc/gitlab-basics/README.md

+# GitLab basics
+
+Step-by-step guides on the basics of working with Git and GitLab.
+
+* [Start using Git on the commandline](start-using-git.md)
+
+* [Create and add your SSH Keys](create-your-ssh-keys.md)
+
+* [Command Line basic commands](command-line-commands.md)
+
+* [Basic Git commands](basic-git-commands.md)

doc/gitlab-basics/basic-git-commands.md

+# Basic Git commands
+
+* Go to the master branch to pull the latest changes from there
+```
+git checkout master
+```
+
+* Download the latest changes in the project, so that you work on an up-to-date copy (this is important to do every time you work on a project), while you setup tracking branches
+```
+git pull REMOTE NAME-OF-BRANCH -u
+```
+(REMOTE: origin) (NAME-OF-BRANCH: could be "master" or an existing branch)
+
+* Create a branch (remember that spaces won't be recognized, you need to use a hyphen or underscore)
+```
+git checkout -b NAME-OF-BRANCH
+```
+
+* Work on a branch that has already been created
+```
+git checkout NAME-OF-BRANCH
+```
+
+* To see the changes you've made (it's important to be aware of what's happening and what's the status of your changes)
+```
+git status
+```
+
+* Add changes to commit (you'll be able to see your changes in red when you type "git status")
+```
+git add CHANGES IN RED
+git commit -m "DESCRIBE THE INTENTION OF THE COMMIT"
+```
+
+* Send changes to gitlab.com
+```
+git push origin NAME-OF-BRANCH
+```
+
+* Throw away all changes in the Git repository, but leave unstaged things
+```
+git checkout .
+```
+
+* Delete all changes in the Git repository, including untracked files
+```
+git clean -f
+```
+
+* Remove all the changes that you don't want to send to gitlab.com
+```
+git add NAME-OF-FILE -all
+```
+
+* Merge created branch with master branch. You need to be in the created branch
+```
+git checkout NAME-OF-BRANCH
+git merge master
+```