update README

Author: cconlon

README.rst

@@ -8,7 +8,7 @@ Welcome
 that encapsulates `wolfSSL's SSL/TLS library
 <https://wolfssl.com/wolfSSL/Products-wolfssl.html>`_.
 
-**wolfSSL's SSL/TLS library** is a lightweight, portable, C-language-based
+The **wolfSSL SSL/TLS library** is a lightweight, portable, C-language-based
 library targeted at IoT, embedded, and RTOS environments primarily because of
 its size, speed, and feature set. It works seamlessly in desktop, enterprise,
 and cloud environments as well.
@@ -22,3 +22,42 @@ We provide Python wheels (prebuilt binaries) for OSX 64 bits and Linux 64 bits:
 .. code-block:: bash
 
     $ pip install wolfssl
+
+To build wolfssl-py from source:
+
+.. code-block:: bash
+
+    $ cd wolfssl-py
+    $ pip install .
+
+The default pip install clones wolfSSL from GitHub. To build wolfssl-py using a
+local installation of the native wolfSSL C library, the USE_LOCAL_WOLFSSL
+environment variable should be set.  USE_LOCAL_WOLFSSL can be set to "1" to use
+the default library installation location (/usr/local/lib, /usr/local/include),
+or to use a custom location it can be set to the install locaiton of your native
+wolfSSL library.  For example:
+
+.. code-block:: bash
+
+    # Uses default install location
+    $ USE_LOCAL_WOLFSSL=1 pip install .
+
+    # Uses custom install location
+    $ USE_LOCAL_WOLFSSL=/tmp/install pip install .
+
+Tests
+=====
+
+To run the tests that ship with wolfssl-py, after compiling the library run
+one of the following commands:
+
+.. code-block:: bash
+
+    $ pytest
+    $ py.test tests
+
+Support
+=======
+
+For support and questions, please email support@wolfssl.com.
+