Update README.md

Author: stephenchouca

README.md

@@ -36,7 +36,8 @@ Build taco using CMake 2.8.3 or greater:
     cd build
     cmake -DCMAKE_BUILD_TYPE=Release ..
     make -j8
-  
+
+## Building Python API
 To build taco with the Python API (pytaco), add `-DPYTHON=ON` to the cmake line above. For example:
 
     cmake -DCMAKE_BUILD_TYPE=Release -DPYTHON=ON ..
@@ -47,10 +48,12 @@ You will then need to add the pytaco module to PYTHONPATH:
 
 pytaco requires NumPy and SciPy to be installed.
 
+## Building for OpenMP
 To build taco with support for parallel execution (using OpenMP), add `-DOPENMP=ON` to the cmake line above. For example:
 
     cmake -DCMAKE_BUILD_TYPE=Release -DOPENMP=ON ..
 
+## Building for CUDA
 To build taco for NVIDIA CUDA, add `-DCUDA=ON` to the cmake line above. For example:
 
     cmake -DCMAKE_BUILD_TYPE=Release -DCUDA=ON ..
@@ -63,18 +66,26 @@ Please also make sure that you have CUDA installed properly and that the followi
 
 If you do not have CUDA installed, you can still use the taco cli to generate CUDA code with the -cuda flag.
 
-To run the C++ test suite:
+## Running tests
+To run all tests:
+
+    cd <taco-directory>/build
+    make test
+
+Tests can be run in parallel by setting `CTEST_PARALLEL_LEVEL=<n>` in the environment (which runs `<n>` tests in parallel).
+
+To run the C++ test suite individually:
 
     cd <taco-directory>
     ./build/bin/taco-test
 
-To run the Python test suite:
+To run the Python test suite individually:
 
     cd <taco-directory>
     python3 python_bindings/unit_tests.py
 
 
-# Library Example
+# Library example
 
 The following sparse tensor-times-vector multiplication example in C++
 shows how to use the taco library.