setup: added commit message template

This change adds the commit message template in file
.git_commit_message.txt. It will be used after once running:
$ git config commit.template .git_commit_message.txt

reviewer=
review url=

.git_commit_template.txt

@@ -0,0 +1,11 @@
+<module>: <title>
+
+<description>
+
+reviewer=
+review url=
+
+#bug=
+#test=
+
+# line length limit ------------------------------------------------------------

README.md

@@ -1,2 +1,9 @@
 ### Masterproject ###
 
+#### Setup ####
+
+Define commit message template:
+$ git config commit.template .git_commit_template.txt
+
+Enable git commandline colors:
+$ git config color.ui true