Add info to the README.md on running the tests

Signed-off-by: Alan Jowett <alan.jowett@microsoft.com>

README.md

@@ -23,6 +23,29 @@ and a simple executable used by the testsuite. After building the
 library you can install using `make -C vm install` via either root or
 sudo.
 
+## Running the tests
+To run the tests, you first need to build the vm code then use nosetests to execute the tests. Note: The tests have some dependencies that need to be present. See the [.travis.yml](https://github.com/iovisor/ubpf/blob/master/.travis.yml) for details.
+
+### Before running the test (assuming Debian derived distro)
+```
+sudo apt-get update
+sudo apt-get -y install python python-pip python-setuptools python-wheel python-nose
+python2 -m pip install --upgrade "pip<21.0"
+python2 -m pip install -r requirements.txt
+python2 -m pip install cpp-coveralls
+```
+
+### Running the test
+```
+make -C vm COVERAGE=1
+nosetests -v   # run tests
+```
+
+### After running the test
+```
+coveralls --gcov-options '\-lp' -i $PWD/vm/ubpf_vm.c -i $PWD/vm/ubpf_jit_x86_64.c -i $PWD/vm/ubpf_loader.c
+```
+
 ## Compiling C to eBPF
 
 You'll need [Clang 3.7](http://llvm.org/releases/download.html#3.7.0).