add git-retag.sh to README

README.md

@@ -68,6 +68,20 @@ optional parameters, can appear in any order
 \<debug\> run in debug mode
 \<silent\> suppress success message
 
+## git-retag.sh
+Remove existing tags and create a new tag based on %version-%release in spec file (without trailing el7.sme)
+
+    git-retag.sh <repository> <organisation> [<local> <debug> <noisy>]
+
+* \<repository\> repository to be retagged
+* \<organisation\> organisation\owner that the repository belongs to
+
+optional parameters, can appear in any order
+
+\<local\> will use parameters set for local repository, else it will use remote
+\<debug\> run with debug output
+\<noisy\> will will print a line showing how it was called
+
 ## parse-list.sh
 Parse a list of parameters and execute script with those parameters