docs: README and getting help (#23)

README.md

@@ -0,0 +1,6 @@
+Envoy
+=========
+
+C++ L7 proxy and communication bus
+
+https://lyft.github.io/envoy

docs/intro/getting_help.rst

@@ -5,10 +5,25 @@ We are very interested in building a community around Envoy. Please reach out to
 interested in using it and need help or want to contribute.
 
 Google Groups
-  FIXFIX
+-------------
+
+* `envoy-announce <https://groups.google.com/forum/#!forum/envoy-announce>`_: Low frequency mailing
+  list where we will email announcements only.
+* `envoy-users <https://groups.google.com/forum/#!forum/envoy-users>`_: General user discussion.
 
 IRC
-  FIXFIX
+---
+
+* `#envoy <http://webchat.freenode.net/?channels=envoy>`_
+* `lyft/envoy on Gitter <https://gitter.im/lyft/envoy>`_
+
+Feel free to drop into either Gitter or the IRC channel for any reason, even
+if just to chat. It doesn't matter which one you join, the messages are sync'd
+between the two.
+
+Reporting security vulnerabilities
+----------------------------------
 
-Gitter
-  FIXFIX
+If you've found a vulnerability or a potential vulnerability in Envoy please let us know at
+[email protected]. We'll send a confirmation email to acknowledge your report, and we'll send an
+additional email when we've identified the issue positively or negatively.