Fix maximum recursion depth exceeded error

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Related to #3

Implements error handling and recursion limit adjustment in lsofgraph.py to address the "maximum recursion depth exceeded" error, and updates the README.md with a note on handling large datasets.

• Recursion Limit Adjustment: Adds sys.setrecursionlimit(15000) at the beginning of the if __name__ == '__main__': block in lsofgraph.py to preemptively increase the recursion limit before processing starts.
• Error Handling: Wraps the main execution block in a try-except statement to catch RuntimeError related to recursion depth, providing a more graceful error message suggesting an increase in the recursion limit.
• Documentation Update: Adds a note in README.md under the "Generate graph" section, advising on the potential for a "maximum recursion depth exceeded" error when handling large datasets and suggesting the workaround of increasing the recursion limit.

[akme]

LGTM