chore(init): add initial gitignore and blog articles
- Add .gitignore to ignore system files like .DS_Store
- Add empty CLAUDE.md and GROK.md files
- Add initial articles on software testing topics: Agile-Or-Whatever-You-Call-It.md, Testers-As-Explorers.md, The-Various-Uses-Of-Vegetable-Condiments-In-Testing.md, five-essential-lessons.md, perfection-and-testing.md, resources-for-testers.md, the-categories-of-testing.md, the-logic-of-software-testing.md, the-perturbation-theory-of-exploratory-testing.md, what-is-a-competent-tester.md, what-makes-us-better.md
- Include assets for articles in assets/ directory
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