Updated README

README.md

@@ -1,2 +1,10 @@
 # rive-cpp
 C++ runtime for Rive
+
+## Build
+In the ```rive``` directory, run ```build.sh``` to debug build and ```build.sh release``` for a release build.
+
+## Testing
+In the ```test``` directory, run ```test.sh``` to compile and execute the tests.
+
+The tests themselves live in ```rive/test```. To add new tests, create a new xxx_test.cpp file here. The test harness will automatically pick up the new file.