Break Ethereum Deployer into crate

processor/ethereum/deployer/README.md

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+# Ethereum Smart Contracts Deployer
+
+The deployer for Serai's Ethereum contracts.
+
+## Goals
+
+It should be possible to efficiently locate the Serai Router on an blockchain with the EVM, without
+relying on any centralized (or even federated) entities. While deploying and locating an instance of
+the Router would be trivial, by using a fixed signature for the deployment transaction, the Router
+must be constructed with the correct key for the Serai network (or set to have the correct key
+post-construction). Since this cannot be guaranteed to occur, the process must be retryable and the
+first successful invocation must be efficiently findable.
+
+## Methodology
+
+We define a contract, the Deployer, to deploy the router. This contract could use `CREATE2` with the
+key representing Serai as the salt, yet this would be open to collision attacks with just 2**80
+complexity. Instead, we use `CREATE` which would require 2**80 on-chain transactions (infeasible) to
+use as the basis of a collision.
+
+In order to efficiently find the contract for a key, the Deployer contract saves the addresses of
+deployed contracts (indexed by the initialization code hash). This allows using a single call to a
+contract with a known address to find the proper Router.