[Media Common] Bump up media version to 21.1.0

Version bump up and readme minor change
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 56ef546..caa8d32 100755
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -20,7 +20,7 @@
 
 cmake_minimum_required(VERSION 3.5)
 
-set(MEDIA_VERSION "20.4.4${MEDIA_VERSION_EXTRA}" CACHE STRING "" FORCE)
+set(MEDIA_VERSION "21.1.0${MEDIA_VERSION_EXTRA}" CACHE STRING "" FORCE)
 
 include(os_release_info.cmake)
 
diff --git a/README.md b/README.md
index 470d3b5..e35206a 100755
--- a/README.md
+++ b/README.md
@@ -37,10 +37,16 @@
 <workspace>
     |- media-driver
 ```
-4. 
+4. Create build_media new folder under your workspace
 ```
 $ mkdir <workspace>/build_media
 ```
+then the workspace looks like below
+```
+<workspace>
+    |- media-driver
+    |- build_media
+```
 5. 
 ```
 $ cd <workspace>/build_media