added Level 7

l7/1_overlay/_Instructions.txt

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+1) You cloned the master branch an you created a file "feature1.sh". You realize that this is part of a new feature you want to build. Create a local Branch "F1", add the feature1.sh file and push it to the remote branch (also called F1).

l7/1_overlay/feature1.sh

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+#!/bin/bash
+echo FEATURE1