chore: add devrant crawler example project and update README formatting

- Add new examples/crawler directory with Makefile, README, crawler.py, database.py, and main.py
- Include devranta-1.1.0 distribution packages and api_test_results.json
- Remove trailing whitespace and blank lines from README.md for consistent formatting

examples/crawler/Makefile

@@ -0,0 +1,17 @@
+.PHONY: all env install run clean
+
+all: env install run
+
+env:
+	python3 -m venv .venv
+	.
+
+install:
+	. .venv/bin/activate && pip install -r requirements.txt
+	. .venv/bin/activate && pip install -e ../../.
+
+run:
+	. .venv/bin/activate && python main.py
+
+clean:
+	rm -rf .venv