Put new README & CONTRIBUTING file in place

Author: hvr

Diff for: CONTRIBUTING

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+For simple typos and obvious clarifications go ahead and submit a PR.
+
+For more substantial changes, here's some ideas how to articulate your RFC/proposal:
+
+- try to review previous proposals in case similiar ideas were already proposed
+- state clearly what problem your proposal is trying to address
+- if you file an issue rather than a concrete PR, state precisely what you intend to change
+- describe how your change helps addressing the problem
+- describe any disadvantages/trade-offs of the proposal you are aware of
+- describe implications for backward compatibility or changes to Cabal needed

Diff for: README.md

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+# Haskell Package Version Policy (PVP) Specification
+
+This repository is the home of the specification of [Haskell's PVP](http://pvp.haskell.org/) which together
+with the [*Common Architecture for Building Applications and Tools* (CABAL)](https://www.haskell.org/cabal/proposal/pkg-spec.pdf)
+specification provides the foundational framework powering [Hackage](http://hackage.haskell.org),
+Haskell's central package repository.
+
+## Proposing Changes
+
+The PVP evolves over time to adapt to changing requirements of the community.
+Everyone is invited to propose and discuss changes to the policy.
+
+Formally, the PVP is maintained by the [Core Libraries Committee](https://wiki.haskell.org/Core_Libraries_Committee)
+together with the [Hackage Trustees](https://github.com/haskell-infra/hackage-trustees).
+
+Please review the [guidelines for contributing](CONTRIBUTING).