Created change log file

Author: Siddharth Chatrola

src/ResourceManager/RedisCache/ChangeLog.md

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+<!--
+    Please leave this section at the top of the change log.
+
+    Changes for the current release should go under the section titled "Current Release", and should adhere to the following format:
+
+    ## Current Release
+    * Overview of change #1
+        - Additional information about change #1
+    * Overview of change #2
+        - Additional information about change #2
+        - Additional information about change #2
+    * Overview of change #3
+    * Overview of change #4
+        - Additional information about change #4
+
+    ## YYYY.MM.DD - Version X.Y.Z (Previous Release)
+    * Overview of change #1
+        - Additional information about change #1
+-->
+## Current Release
+* Allow any string as Size parameter going forward. Add P5 in PSArgumentCompleter popup