pkm: add internet research tips

docs/pkm/internet-research-tips.md

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+# Internet Research Tips
+
+## Guides
+
+- [A look at search engines with their own indexes](https://seirdy.one/posts/2021/03/10/search-engines-with-own-indexes/)
+- [gwern Internet Search Tips](https://gwern.net/searc): description of advanced tips and tricks for effective Internet research of papers/books, with real-world examples
+
+## Legal
+
+- [judyrecords](https://www.judyrecords.com/): Instantly search 740M+ United States court cases
+- [PACER](https://pacer.uscourts.gov/): PACER is the official case management system of US Federal Judiciary
+  - 56M+ federal court cases, including bankruptcy, criminal, civil, and appellate
+  - Fee-based for every kind of request for case info, including each search result page viewed, and even when a search returns no results
+- [CourtListener](https://courtlistener.com/): Primarily focused on federal courts, state courts of last resort, and state appellate courts
+  - 4M+ Federal/State court opinions
+  - 70K+ oral arguments
+  - 38K+ hours of oral argument audio
+  - Free
+- [Docket Alarm](https://www.docketalarm.com/): Delivers Federal state, and IP agency filings to attorneys, paralegals. Search and run analytics
+  - 26M+ federal cases
+  - 91M+ state cases
+  - 19M+ specialized agency cases (patent, trademark, tax, international trade, etc.)
+  - Free searches + premium access upsell
+- [UniCourt](https://unicourt.com/): Uses powerful data normalization processes and algorithms to add value to their legal data, which includes normalization of case classification and entity names (e.g., people, companies, attorneys, law firms, judges)
+  - 9M+ Federal cases
+  - 114M+ State cases
+  - Free searches + premium access upsell