Add readme

Author: rodarima

README.md

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+# Dillo RFC documents
+
+This repository contains Dillo RFC documents that describe large changes or
+features that require some thought.
+
+For now we only define two states for each document:
+
+- Draft: Still in development.
+- Ratified: The final version.
+
+For now let's use Markdown, which is easy to write and keep under source
+control.