Update README

Clean up the readme to clarify API compatibility support and bring in-line with other Calico README files.

README.md

@@ -1,34 +1,42 @@
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 # libcalico-go
-This repositiory contains Calico's Go components:
+<img src="http://docs.projectcalico.org/images/felix.png" width="100" height="100">
 
-- `libcalico`, which can be imported as `"github.com/projectcalico/libcalico-go/lib"`
+This repository contains the internal library for interacting with the Calico data store as well as common source code used across Calico components. Note that the APIs defined in this library are not guaranteed to be forwards or backwards compatible and may change at any time without notice.
 
-This library is used by: 
-  - [calicoctl](https://github.com/projectcalico/calicoctl)
-  - [Calico CNI plugin](https://github.com/projectcalico/calico-cni)
-  - [Calico libnetwork plugin](https://github.com/projectcalico/libnetwork-plugin)
-  - [felix](https://github.com/projectcalico/felix).
-
-If you wish to use libcalico for integration with Calico networking and
-policy, the main entry point to managing Calico configuration is through
-the client.
+Calico is a Tigera open source project, and is primarily maintained by the Tigera team. However any members of the community – individuals or organizations – are welcome to get involved and contribute to the project. 
 
--  Documentation for the client is in [lib/client GoDoc](https://godoc.org/github.com/projectcalico/libcalico-go/lib/client).
--  The resource structure definitions are defined in [lib/api](https://godoc.org/github.com/projectcalico/libcalico-go/lib/api), this
-   includes detailed per-resource and per-field level descriptions.
--  Resource definitions can be found in [Calico docs](http://docs.projectcalico.org/master/reference/calicoctl/resources/)
--  This repository also includes the implementation for Calico IPAM which can be found in `lib/client` 
+## Get Started Using Calico
 
-If you are developing against the code in libcalico, please run the tests before
-submitting a Pull Request.
+For users who want to learn more about the project or get started with Calico, see the documentation on [docs.projectcalico.org](https://docs.projectcalico.org).
+
+## Get Started Developing Calico
+
+### Making changes to libcalico-go
+
+Contributions to this code are welcome!  The code in this repository can be built and tested using the Makefile.
 
 To run the tests locally (requires a full golang environment Go 1.7+):
 
     make ut
 
-To run the tests within a containerized environment:
+To run the tests within a containerized environment (requires a [functioning Docker installation](https://docs.docker.com/engine/installation/)):
 
     make test-containerized
 
+For more information on available targets, see `make help`.
+
+### Developing against libcalico-go
+
+If you wish to use libcalico for integrating with Calico networking and
+policy, the main entry point to managing Calico configuration is through
+the client.
+
+-  Documentation for the client is in [lib/client GoDoc](https://godoc.org/github.com/projectcalico/libcalico-go/lib/client).
+-  The resource structure definitions are defined in [lib/api](https://godoc.org/github.com/projectcalico/libcalico-go/lib/api), this
+   includes detailed per-resource and per-field level descriptions.
+
+
+
+