[+] Added information on the assembly and unit testing.

README.md

@@ -2,3 +2,14 @@
 Python binding for libdap
 
 [![Build Status](https://travis-ci.com/cellframe/libdap-python.svg?branch=master)](https://travis-ci.com/cellframe/libdap-python)
+
+## Build and Run tests:
+```
+git submodule update --init
+mkdir build
+cd build
+cmake -DBUILD_DAP_PYTHON_TESTS=ON ../
+make
+cd test
+python3.7 main_test.py
+```