webdriver: Help googlers (#54)

Provides info I was looking for when this came up on Google.

Source-Repo: https://github.com/mozilla/webdriver-rust
Source-Revision: a7986df7f2db19b1f648d09a5a6a884afe25369b

committer: James Graham <james@hoppipolla.co.uk>

--HG--
extra : subtree_source : http%3A//tristan.corp.lon2.mozilla.com%3A8000
extra : subtree_revision : 7cd3060dfc35f13aa98aa68b6091e6d1ead0cdc4

testing/webdriver/README.md

@@ -1,3 +1,5 @@
 # webdriver-rust
 
+As of right now this is an implementation for the server side of the WebDriver API, not the client side.
+
 [Documentation](https://docs.rs/webdriver/)