Merge branch 'ad-creation-supersede-a-mr' into 'develop'

Ad creation supersede a mr

See merge request !483

external/contribute/supersede/supersede.md

+---
+layout: page
+permalink: /external/contribute/supersede/
+shortcut: contribute:supersede
+redirect_from:
+  - /cards/contribute:supersede
+  - /external/cards/contribute:supersede
+  - /contribute/supersede
+  - /external/external/contribute/supersede/
+---
+
+# Take over a stale merge request
+
+In some cases, it might be useful to move the Merge Request of a branch opened by someone else to your own fork.
+
+1. Open *Visual Studio Code*.
+2. Select the ***develop*** branch and synchronize it.
+3. In ***Terminal***, click on ***New Terminal***.
+
+<div align="center">
+<img src="img/img1.png" width="700">
+</div>
+
+**Steps 4 and 5 needs to be performed only the first time.**
+
+4. If not done yet, configure the git mr command by following those [instructions](https://docs.gitlab.com/ee/user/project/merge_requests/reviews/#checkout-locally-by-adding-a-git-alias).
+
+   4.1 Open *Git Bash*
+
+    4.2 Type *vim ~/.gitconfig* - *Enter*
+
+    4.3 Type *i*
+
+    4.4 Type 
+
+    [alias]
+
+    mr = !sh -c 'git fetch $1 merge-requests/$2/head:mr-$1-$2 && git checkout mr-$1-$2' -
+
+    <div align="center">
+    <img src="img/img5.png" width="700">
+    </div>
+
+    4.5 Type *:wq*
+
+
+5. In the *Terminal window*, type *git remote add upstream [paste the SSH Key]*.
+You can copy the SSH key of the repository by clicking on Clone - copy on the repository page.
+
+<div align="center">
+<img src="img/img3.png" width="700" >
+</div>
+<div align="center">
+<img src="img/img2.png" width="300" >
+</div>
+
+6. In the *Terminal window*, type *git mr upstream [number of the merge request]*.
+
+    You are now on the branch of the merge request.
+
+7. Push it to your fork by clicking on the cloud icone on the bottom left of your screen.
+
+<div align="center">
+<img src="img/img4.png"  width="100"  >
+</div>
+
+8. On GitLab, open a new Merge Request with the newly created branch.
+    
+    In description, write ***Supersedes ![number of the original MR]***.
+
+9. In the original MR, write in the description ***Superseded by ![number of the newly created MR]*** and close the MR.
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