Implement Doom for M5Stack CardPuter

[vs4vijay]

Implements full input handling and updates documentation for the M5Stack CardPuter Doom port.

• Input Handling:

  • Removes commented-out input handling code in src/main.cpp and retains the updated DG_GetKey function to process the key queue for Doom inputs.
  • Adds a new file m5card.c which appears to be a duplicate of the modified src/main.cpp, including the same input handling and game loop logic.

• Documentation:

  • Updates README.md with a new section titled "Porting to M5Stack CardPuter" that includes hardware requirements, compiling and uploading instructions, and how to prepare the SD card with a WAD file.

• Build Configuration:

  • Introduces a new Makefile.m5card for compiling the Doom port for the M5Stack CardPuter, suggesting a shift towards a more structured build process. This file includes compiler settings, source and object file definitions, and the target binary configuration.

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