added readme file

README.md

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+RPKI ROA Sanity Checker
+
+This Python app checks the information for a proposed RPKI-ROA, provided by the user via a web form, against exiting routes seen on the Internet and reported by RIPEstat. The response will include a row for the route matching the proposed ROA's prefix, and additional rows for any more specific routes seen on the Internet.
+
+Each row contains four columns:
+
+1. The prefix being evaluated.
+2. The result of the proposed ROA applied to the prefix.
+3. The origin ASN seen via RIPEstat for the prefix.
+4. The status of any existing ROA that covers this prefix.
+
+The app is designed to be invoked as a docker command:
+```
+docker run -dp 8000:8000 stevenisfine/roa_checker:latest
+```
+
+