add a lib for rendering text in sdl2 and rules to make in makefile

SDL2_ttf/external/harfbuzz/README.python.md

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+To enable HarfBuzz bindings for Python among other languages, make sure
+you have latest version of gobject-introspection available.  On Ubuntu,
+you can install that this way:
+
+```bash
+sudo apt-get install libgirepository1.0-dev
+```
+
+And then run `meson setup` and make sure that `Introspection` is reported
+enabled in output.
+
+If you are building with Visual Studio, it is recommended that Visual Studio
+2019 or later is used for this build, for the best build experience.
+
+Compile and install.
+
+Make sure you have the installation lib dir in `LD_LIBRARY_PATH` (or the
+installation DLL dir in `PATH` for Windows systems), as needed
+for the linker to find the library.
+
+Then make sure you also have `GI_TYPELIB_PATH` pointing to the resulting
+`$prefix/lib/girepository-*` directory.
+
+Make sure you have pygobject installed.  Then check that the following
+import works in your Python interpreter:
+
+```python
+from gi.repository import HarfBuzz
+```
+
+If it does, you are ready to call HarfBuzz from Python!  Congratulations.
+See [`src/sample.py`](src/sample.py).
+
+The Python API will change.  Let us know on the mailing list if you are
+using it, and send lots of feedback.