add shared README.rst and coverage

.coveragerc

@@ -0,0 +1,13 @@
+[run]
+omit =
+    */test/*
+    */tests/*
+    *.html
+    *.js
+    *.css
+    pywb/__init__.py
+
+[report]
+exclude_lines =
+    pragma: no cover
+    if __name__ == .__main__.:

README.rst

@@ -0,0 +1,13 @@
+Webrecorder Platform Components
+-------------------------------
+
+See `Platform spec <https://github.com/webrecorder/platform-spec/wiki>`_ for more details.
+
+This repo contains an implementation for following components:
+
+
+* Resource/Memento Aggregator `webagg <webagg/>`_
+
+* Recorder `recorder <recorder/>`_
+
+