add build and test instructions to readme

README.md

@@ -8,10 +8,46 @@ The maiden project is a GPU accelerated 3D rendering engine built with C++ based
 
 ## Getting Started
 
-### git instructions here
-### build instructions here
+### Clone Repository
+```bash
+$ git clone https://git.vxbard.net/homeburger/maiden.git
+
+# If there's any necessary submodules then:
+$ git clone --recurse-submodules https://git.vxbard.net/homeburger/maiden.git
+
+# If you have already cloned the repository and you need its submodules:
+$ git submodule update --init --recursive
+```
+### Build 
+This app uses CMake and C++20, so a compatible compiler (gcc8, clang9, msvc16) are necessary.
+
+Most library prerequisites are handled within CMake. Any others that need to be manually installed will be described below as the project grows.
+
+To build the project (using default build directory "build"):
+```bash
+# configure
+$ cmake -S . -B build # + any extra options
+
+# build
+$ cmake --build build -j
+
+# execute
+$ cd build
+$ ./maiden
+```
+
+### Testing
+This app uses GoogleTest for building unit tests. The below instructions use ctest and gcovr for test execution and code coverage:
+```bash
+# execute unit tests
+$ ctest -T Test # + filter options
+
+# analyze code coverage
+$ cd build
+$ gcovr -r .. --filter "../src"
+```
+
 ### app troubleshooting here
-### testing instructions here
 
 ## Development Roadmap
 ### lots of todo here