update chPick pres1

2019/2019-09-09_testCourseAdv/slides/chPickPresentation.md

-## Cherry Picking Commits
-
-Let's take our develop branch and say it has a row of commits.  
-If only certain of these commits are important for the master  
-branch, using the command  
-
-```bash
-git cherry-pick ZZ
-```
-
-we can take only the relevant changes from develop and merge them  
-into master.
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2019/2019-09-09_testCourseAdv/slides/chPickPresentation1.md

+## Cherry Picking Workshop
+
+* In your branch, create a reference file
+```bash
+$ echo "This is the start of a commit chain" > reference.txt
+```
+
+* Create two files in the develop branch 
+```bash
+$ echo "This is a commit to keep" > keep.txt
+$ echo "Ignore this commit" > ignore.txt
+```
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