Add development notes

DEVELOPMENT.md

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+# Notes for Developer
+
+- `main.py`: used for mkdocs-macros-plugin, implement functions used in markdown.
+- `check.py`: check generated docs against gcc intrinsics document.
+- `check_instr.py`: check generated docs against binutils opcodes.
+- `code/find_vd_source.py`: locate functions that have vd/xd as a source operand.
+- `code/gen_impl.py`: generate C implementations for intrinsics.
+- `code/gen_tb.py`: generate testbench for intrinsics.
+- `code/untest.py`: list untested intrinsics.
+- `code/gen_measure.py`: generate `measure.h` to measure latency and throughput of instructions.
+- `code/Makefile`: use `make run` to validate C implementations against hardware, use `make run-measure` to measure latency and throughput.