doc: update readme with developer tools setting #7688

Job	Run time
LPython CI (3.10, macos-latest)	9m 45s
LPython CI (3.10, windows-2025)	16m 19s
Test PIP Installable Packages	3m 3s
LPython CI (3.10, ubuntu-latest)	10m 26s
Check Debug build	3m 35s
Check Release build	6m 44s
Run Integration tests with Python 3.9	5m 59s
Build LPython to WASM	7m 13s
Run Integration tests with Python 3.11	3m 28s
Test LLVM 16	3m 20s
Build Jupyter Kernel	4m 0s
Upload Tarball	53s
Run Integration tests with Python 3.10	3m 18s
Run Integration tests with Python 3.12	4m 20s
Test LLVM 15	3m 26s
Test LLVM 10	3m 26s
Run SymPy tests	4m 49s
Test CPython Interop (@pythoncall)	3m 17s
	1h 37m 21s

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