Merge pull request #3 from Textualize/willmcgugan-readme

Update README.md

Author: willmcgugan

README.md

@@ -1,2 +1,7 @@
 # textual-dev
-Development tools for Textual
+
+Development tools for Textual.
+
+This package contains the `textual` command line app, which will help to develop Textual applications.
+
+See [Getting Started](https://textual.textualize.io/getting_started/) for how to use it.