create onboarding.md

Added some reading material for people new to Rust and/or Ethereum. My goal is to expand the onboarding docs to include specific guides on getting started on Lighthouse.

docs/onboarding.md

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+# Learn how to contribute to ETH 2.0!
+
+Lighthouse is an Ethereum 2.0 client built in Rust.
+
+If you are interested in contributing to the Ethereum ecosystem, and you want to learn Rust, Lighthouse is a great project to work on.
+
+Initially this wiki will contain reading material to help get you started in Rust and Ethereum. Eventually it will have guides specific to Lighthouse.
+
+## Learn Rust
+
+* [The Rust Programming Language](https://doc.rust-lang.org/book/2018-edition/index.html)
+
+## Learn Ethereum
+
+#### General Ethereum Resources
+* [What is Ethereum](http://ethdocs.org/en/latest/introduction/what-is-ethereum.html)
+* [Ethereum Introduction](https://github.com/ethereum/wiki/wiki/Ethereum-introduction)
+
+#### Ethereum 2.0
+* [Ethereum 2.0 Spec - Casper and Sharding](https://github.com/ethereum/eth2.0-specs/blob/master/specs/beacon-chain.md)
+
+#### Sharding
+
+* [How to Scale Ethereum: Sharding Explained](https://medium.com/prysmatic-labs/how-to-scale-ethereum-sharding-explained-ba2e283b7fce)
+
+#### Casper
+
+* [Proof of Stake - Casper FFG](https://www.youtube.com/watch?v=uQ3IqLDf-oo)
+* [Beacon Casper Chain](https://www.youtube.com/watch?v=GAywmwGToUI)
+
+### TODO
+- add reading material as we discover.
+- start developing guides specific to lighthouse.