Create 05-keyword-and-pattern-search.md

Author: ngvuthdanhh

operations/05-keyword-and-pattern-search.md

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+# 05 — Keyword & Pattern Search
+
+## Keyword Logic
+- Base terms + stem variations.
+- Synonyms relevant to context.
+- Exclusion filters to reduce noise.
+
+## Pattern Matching
+- IPs, URLs, domains
+- File hashes
+- Email addresses
+- Byte signatures
+
+## Search Areas
+- Allocated space
+- Unallocated space
+- Slack space
+- Log files
+
+## Prioritization Rules
+- High-severity indicators
+- User-specific keywords
+- Rare or out-of-place patterns