update chPick pres1

2019/2019-09-09_testCourseAdv/slides/chPickPresentation1.md

@@ -5,8 +5,12 @@
 $ echo "This is the start of a commit chain" > reference.txt
 ```
 
-* Create two files in the develop branch 
+* Create and commit two files in the develop branch 
 ```bash
 $ echo "This is a commit to keep" > keep.txt
+$ git add keep.txt
+$ git commit origin develop
 $ echo "Ignore this commit" > ignore.txt
+$ git add ignore.txt
+$ git commit origin develop
 ```
\ No newline at end of file