Update readme build instructions (#96)

README.md

@@ -1,5 +1,18 @@
-# jito-relayer
-Jito Relayer acts as a transaction processing unit (TPU) proxy. 
-It filters and verifies transactions for multiple authenticated validators on a separate server to ensure validators can devote resources to executing transactions.
+# Jito Relayer
+Jito Relayer acts as a transaction processing unit (TPU) proxy for Solana validators.
 
+# Building
+```shell
+# pull submodules to get protobuffers required to connect to Block Engine and validator
+$ git submodule update -i -r
+# build from source
+$ cargo b --release
+```
+
+# Releases
+There are two options for running the relayer from releases:
+- Download the most recent release on the [releases](https://github.com/jito-foundation/jito-relayer/releases) page.
+- (Not recommended for production): One can download and run Docker containers from the Docker [registry](https://hub.docker.com/r/jitolabs/jito-transaction-relayer).
+
+# Running a Relayer
 See https://jito-foundation.gitbook.io/mev/jito-relayer/running-a-relayer for setup and usage instructions.