Add full Markdown documentation set

README.md

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+# DynamORM
+
+Dynamic ORM and SQL builder for .NET, with dynamic and typed APIs.
+
+## Documentation
+
+Full documentation is available in [`docs/README.md`](docs/README.md):
+
+- Quick start
+- Dynamic table API
+- Fluent builder API
+- Mapping and entity lifecycle
+- Transaction/disposal semantics
+- Stored procedures
+- .NET 4.0 amalgamation workflow
+- Test-driven examples
+
+## Repository Layout
+
+- `DynamORM/`: core library
+- `DynamORM.Tests/`: test suite
+- `AmalgamationTool/`: amalgamation generator and generated single-file output
+- `DynamORM.Net40.csproj`: net40 build for amalgamated source compatibility