actually add vendor folder

vendor/raylib-cpp/projects/CMake/README.md

@@ -0,0 +1,31 @@
+# raylib-cpp CMake Example Project
+
+Use this template to build a [raylib-cpp](https://github.com/RobLoach/raylib-cpp) project using [CMake](https://cmake.org).
+
+## Build
+
+To build this project, make sure to have CMake installed locally.
+
+### Desktop
+
+```
+mkdir build
+cd build
+cmake ..
+make
+```
+
+### Web
+
+```
+mkdir build
+cd build
+emcmake cmake .. -DPLATFORM=Web -DCMAKE_BUILD_TYPE=Release
+emmake make
+```
+
+## Run
+
+```
+./raylib-cpp-example
+```