added readme (#21)

README.md

@@ -0,0 +1,34 @@
+# ray-tracing
+
+A raytracing project created for the purpose of learning
+
+## Downloading and Building the Project
+
+This project can be downloaded by using the 
+```
+git clone --recurse-submodules https://github.com/abdelrahim-hentabli/ray-tracing.git
+```
+or
+```
+git clone --recurse-submodules [email protected]:abdelrahim-hentabli/ray-tracing.git
+```
+
+
+The library/executables can be built by calling (from within the project directory): 
+```
+mkdir build && cd build
+cmake -DCMAKE_BUILD_TYPE=Release ..
+cmake --build . --parallel <# of cores available for build>
+```
+
+### Running the tests/benchmarks
+
+Tests can be run by calling the executable at
+```
+./build/tools/test/tests
+```
+
+And benchmarks can be run by calling
+```
+./build/tools/benchmark/benchmarks
+```