README: add docs badge

2018-09-23 17:11:13 +02:00 · 2018-09-23 17:11:13 +02:00 · 4868823dad
--- a/README.markdown
+++ b/README.markdown
@ -1,5 +1,7 @@
 # TinyGo - Go compiler for microcontrollers

+[![Documentation Status](https://readthedocs.org/projects/tinygo/badge/?version=latest)](https://tinygo.readthedocs.io/)
+
 > We never expected Go to be an embedded language and so it's got serious
 > problems [...].