Update README.md

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@@ -14,3 +14,8 @@ in the future.
     cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=/usr -DBUILD_SHARED_LIBS=True ..
     make
     make DESTDIR=install_destination install
+
+## Usage
+
+The program in `src/test/UDPC_NetworkTest.c` is used for testing UDPConnection
+and is also an example of using the library in a C program.