Added basic_rs, basicwasm, EndBASIC, gobasic to new BASIC section

[vasilev]

Added basic_rs, basicwasm, EndBASIC, and gobasic to new BASIC section.

Proofs

• basic_rs - declares WASM support and has Game of Life demo compiled from BASIC source.
• basicwasm - I've managed (it needs a patch to current version in master branch) to compile its web REPL and tested it. At least PRINT, LOCATE, CLS, COLOR commands work well.
• EndBASIC - advertises WASM support and provides a web REPL as demo here.
• gobasic - I've compiled embed example to WASM and printing works well: it prints the expected text into browser console.

This is a BASIC portion of #140 .

[vasilev]

Edit: The fix was accepted, so REPL built from basicwasm's current master works OK now.