Added README.md and demo image for blog

apps/blog/README.md

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+# ActivityPub Blog
+
+This folder is based on:
+
+* https://github.com/tsileo/microblog.pub
+* https://github.com/tsileo/little-boxes
+
+Goals:
+
+* database independent (can use redis, sql, mongo, etc)
+* web framework independent (can use flask or tornado)
+* develop a multi-user blog with users
+* complete support of ActivityPub
+
+Work in progress!
+
+![Demo](images/demo.png)
+
+To run, see [installation](../README.md) and then:
+
+1. Edit app.py for your own database/framework combination.
+
+2. Run:
+
+```
+python3 app.py
+```