Add README

Signed-off-by: Stephanos Ioannidis <root@stephanos.io>

Author: stephanosio

README.md

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+# crosskit-aarch64-linux-libpython
+
+This repository contains the `libpython` libraries and headers for the AArch64
+Linux, in order to facilitate non-AArch64 to AArch64 Linux cross compilation of
+the programs that depend on the `libpython` library (e.g. GDB).
+
+__SUPERHACK WARNING!__ This repository also contains a special shell script
+(`${LIBPYTHON_KIT_ROOT}/bin/python`) to allow the GDB build system to resolve
+the `include` and `lib` paths for the host Python.
+
+## Build GDB
+
+```
+/usr/local/src/gdb-9.1/configure \
+    --build=x86_64-build_pc-linux-gnu
+    --host=aarch64-linux-gnu
+    --target=arm-none-eabi
+    --prefix=<OUTDIR>
+    --with-python=${LIBPYTHON_KIT_ROOT}/bin/python
+```