Freshen up the README file to have more relevant info.
Freshen up the README file to have more relevant info.

BUG = http://code.google.com/p/nativeclient/issues/detail?id=1047
TEST = Read the file and make sure it matches up with the codesite pages.

Review URL: http://codereview.chromium.org/3838002

git-svn-id: e22621a84199d42b34715cdc089545aeedbbf23f@599 050acbb0-2703-11df-ab0a-9f3f633ae91d

sbc100/nativeclient-sdk,sbc100/nativeclient-sdk,sbc100/nativeclient-sdk,sbc100/nativeclient-sdk,sbc100/nativeclient-sdk,sbc100/nativeclient-sdk,sbc100/nativeclient-sdk