Adding dev docs

dev-docs/README.md

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+# Memo Indexer Developer Documentation
+
+This directory documents the architecture, operation, and design rationale for the Permissionless Software Foundation Memo indexing stack:
+
+| Repository | Role |
+|------------|------|
+| [psf-memo-db](../../psf-memo-db) | LevelDB persistence exposed as a REST API |
+| [psf-memo-indexer](../) | Block and mempool indexer (this repo) |
+
+Protocol reference: [memo-protocol.md](../../memo-protocol.md). Reference implementation: [memo/index](../../index) (Go).
+
+## Reading order
+
+1. **[Overview](./overview.md)** — Why these services exist and what they produce
+2. **[Architecture](./architecture.md)** — Components, processes, Clean Architecture layout, data flow
+3. **[Theory of operation](./theory-of-operation.md)** — IBD, ZMQ, parsing, indexing pipeline step-by-step
+4. **[psf-memo-db](./psf-memo-db.md)** — Database service design and REST contract
+5. **[Design decisions and tradeoffs](./design-decisions-and-tradeoffs.md)** — Comparisons to SLP and the Go indexer, scope limits, future work
+
+## Related material
+
+- Production deployment: [production/docker](../production/docker/)
+- SLP analogue: [psf-slp-indexer-g2](https://github.com/Permissionless-Software-Foundation/psf-slp-indexer-g2) and [psf-slp-db](https://github.com/Permissionless-Software-Foundation/psf-slp-db)
+- Clean Architecture primer: [Chris Troutner — Clean Architecture](https://christroutner.github.io/trouts-blog/blog/clean-architecture)