README for compiling and using the example_project

cmake/example_project/README.md

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+# MATLAB Wrapper Example Project
+
+This project serves as a lightweight example for demonstrating how to wrap C++ code in MATLAB using GTSAM.
+
+## Compiling
+
+We follow the regular build procedure inside the `example_project` directory:
+
+```sh
+mkdir build && cd build
+cmake ..
+make -j8
+sudo make install
+
+sudo ldconfig  # ensures the shared object file generated is correctly loaded
+```
+
+## Usage
+
+Now you can open MATLAB and add the `gtsam_toolbox` to the MATLAB path
+
+```matlab
+addpath('/usr/local/gtsam_toolbox')
+```
+
+At this point you are ready to run the example project. Starting from the `example_project` directory inside MATLAB, simply run code like regular MATLAB, e.g.
+
+```matlab
+pe = example.PrintExamples();
+pe.sayHello();
+pe.sayGoodbye();
+```