Bootstrap the Jack compiler Python package.

books/nand2tetris/projects/10_compiler_i_syntax_analysis/jack_compiler/
	-Bootstrap the Jack compiler's Python package directory
	hierarchy and touch member files.
Add a README to the Jack Compiler.

books/nand2tetris/projects/10_compiler_i_syntax_analysis/README.md
	-Add a (currently brief) README to the Jack Compiler project.

books/nand2tetris/projects/7_8_virtual_machine/README.md
	-Make a minor update to the README title for consistency with
	`10_compiler_i_syntax_analysis/README.md`.