Update COBOL lecture notes and add "Hello, World!" example program #3
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This pull request updates the COBOL lecture notes and adds a "Hello, World!" example program. The lecture notes provide an introduction to COBOL, its history, and its key features. The example program demonstrates a simple "Hello, World!" program in COBOL. Additionally, the README file has been updated with installation instructions for COBOL compilers and acknowledgements. The build script has also been updated to check if the source file exists before compiling it.