Added Cm_Redis files to .gitignore (#2779)

Author: sreichel

.gitignore

@@ -18,6 +18,11 @@
 # Openmage config
 /app/etc/local.xml
 
+# CM Redis
+/app/code/community/Cm
+/app/etc/modules/Cm_RedisSession.xml
+/lib/Credis
+
 # Add a base setup for running unit Tests with code coverage and send them to SonarCloud
 # https://github.com/OpenMage/magento-lts/pull/1836
 /dev/testfield