Merge pull request typora#1031 from vassudanagunta/license-clarify

clarify licensing status and purpose of GitHub presence

README.md

@@ -1,6 +1,8 @@
 # Typora
 
-[Typora](http:https://typora.io) (beta) is a minimal markdown editor, providing new ways for reading and writing markdown.
+[Typora](http:https://typora.io) is a minimal markdown editor, providing new ways for reading and writing markdown. It is currently in beta.
+
+Typora is commercial software (not open source), but is free during beta. [Typora on GitHub](https://github.com/typora) supports collaboration between its developer, [Abner Lee](http:https://abnerlee.github.io), and its *user community*, providing a place to transparently report issues, collect feedback and discuss future direction. It also provides open source resources for user customization of themes.
 
 # The Typora Issues Repo