Add CWS badge as a local resource in README.md

The CWS badge is no longer available at
https://developer.chrome.com/webstore/images/ChromeWebStore_Badge_v2_206x58.png,
so this change downloads it to the //docs/resources folder and
references it from //README.md.

Change-Id: Ib935969a1d37e34500422be10d3931f0a58ceff7
diff --git a/README.md b/README.md
index ca81554..d0d6ee2 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,5 @@
 # TW Power Tools
-[![Available in the Chrome Web Store](https://developer.chrome.com/webstore/images/ChromeWebStore_Badge_v2_206x58.png)](https://chrome.google.com/webstore/detail/infinite-scroll-in-tw/hpgakoecmgibigdbnljgecablpipbajb)
+[![Available in the Chrome Web Store](docs/resources/ChromeWebStore_Badge_v2_206x58.png)](https://chrome.google.com/webstore/detail/infinite-scroll-in-tw/hpgakoecmgibigdbnljgecablpipbajb)
 
 An extension which brings several enhancements to the Google Forums and the
 Community Console.
diff --git a/docs/resources/ChromeWebStore_Badge_v2_206x58.png b/docs/resources/ChromeWebStore_Badge_v2_206x58.png
new file mode 100644
index 0000000..a5f08bd
--- /dev/null
+++ b/docs/resources/ChromeWebStore_Badge_v2_206x58.png
Binary files differ