Update README with Requirements, CoC, and text cleanup (#3)

* Add Requirements to README

* Add core value CoC to README

* Moved some sections around in README, fixed some grammar

* Update README requirements for linux/mac

README.md

@@ -16,6 +16,20 @@ The `node-rdkafka` library is a high-performance NodeJS client for [Apache Kafka
 
 To view the reference docs for the current version, go [here](https://blizzard.github.io/node-rdkafka/current/)
 
+## Contributing
+
+For guidelines on contributing please see [CONTRIBUTING.md](https://github.com/blizzard/node-rdkafka/blob/master/CONTRIBUTING.md)
+
+## Code of Conduct
+
+Play nice; Play fair.
+
+## Requirements
+
+* Apache Kafka >=0.9
+* Node.js >=4
+* Linux/Mac (Sorry Windows :()
+
 ## Tests
 
 This project includes two types of unit tests in this project:
@@ -24,13 +38,12 @@ This project includes two types of unit tests in this project:
 
 You can run both types of tests by using `Makefile`. Doing so calls `mocha` in your locally installed `node_modules` directory.
 
+* Before you run the tests, be sure to init and update the submodules: 
+  1. `git submodule init`
+  2. `git submodule update`
 * To run the unit tests, you can run `make lint` or `make test`.
 * To run the integration tests, you must have a running Kafka installation available. By default, the test tries to connect to `localhost:9092`; however, you can supply the `KAFKA_HOST` environment variable to override this default behavior.
 
-## Contributing
-
-For guidelines on contributing please see [CONTRIBUTING.md](https://github.com/blizzard/node-rdkafka/blob/master/CONTRIBUTING.md)
-
 # Usage
 
 You can install the `node-rdkafka` module like any other module: