feat: add document templates library with 10 templates

src/templates/project-plan.md

@@ -0,0 +1,54 @@
+# Project Plan: [Project Name]
+
+**Date:** {{DATE}}
+**Project Lead:** Your Name
+**Status:** Planning
+
+## Goals
+
+1. Primary goal
+2. Secondary goal
+
+## Scope
+
+### In Scope
+- Item 1
+- Item 2
+
+### Out of Scope
+- Item 1
+
+## Milestones
+
+| Milestone | Target Date | Status |
+|-----------|-------------|--------|
+| Kickoff | {{DATE}} | Not Started |
+| MVP | TBD | Not Started |
+| Launch | TBD | Not Started |
+
+## Resources
+
+| Role | Person | Allocation |
+|------|--------|------------|
+| Lead | Name | 100% |
+| Developer | Name | 50% |
+
+## Risks
+
+| Risk | Impact | Likelihood | Mitigation |
+|------|--------|------------|------------|
+| Risk 1 | High | Medium | Plan |
+
+## Timeline
+
+### Phase 1: Planning
+- [ ] Define requirements
+- [ ] Create design documents
+
+### Phase 2: Development
+- [ ] Implement core features
+- [ ] Write tests
+
+### Phase 3: Launch
+- [ ] Deploy to production
+- [ ] Monitor and iterate