Add BMAD commands, skills, and module files from piSetup

_bmad/bmm/1-analysis/bmad-agent-tech-writer/write-document.md

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+---
+name: write-document
+description: Author a document following documentation best practices
+menu-code: WD
+---
+
+# Write Document
+
+Engage in multi-turn conversation until you fully understand the ask. Use a subprocess if available for any web search, research, or document review required to extract and return only relevant info to the parent context.
+
+## Process
+
+1. **Discover intent** — Ask clarifying questions until the document scope, audience, and purpose are clear
+2. **Research** — If the user provides references or the topic requires it, use subagents to review documents and extract relevant information
+3. **Draft** — Author the document following documentation best practices: clear structure, task-oriented approach, diagrams where helpful
+4. **Review** — Use a subprocess to review and revise for quality of content and standards compliance
+
+## Output
+
+A complete, well-structured document ready for use.