Add README with project overview and build instructions

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

README.md

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+# Execution Context Tokens for Distributed Agentic Workflows
+
+This repository contains **draft-nennemann-wimse-execution-context-00**, an IETF Internet-Draft proposing Execution Context Tokens (ECTs) as an extension to the [WIMSE](https://datatracker.ietf.org/wg/wimse/about/) (Workload Identity in Multi System Environments) architecture.
+
+## What are ECTs?
+
+ECTs are signed JWT tokens that record **what** agents did, **in what order**, and **under what policy** -- complementing WIMSE's existing answer to **who** an agent is.
+
+They provide:
+
+- **DAG-structured execution proofs** -- task dependencies form a directed acyclic graph with cryptographic ordering guarantees
+- **Policy checkpoint recording** -- each decision point records which policy was evaluated and the outcome
+- **Immutable audit trails** -- ECTs are appended to a storage-agnostic audit ledger
+- **WIMSE integration** -- same signing keys, algorithms, and SPIFFE-based identifiers as WIT/WPT
+
+Target environments include medtech (FDA audit trails), finance (transaction record-keeping), logistics, and other regulated agentic systems.
+
+## Repository contents
+
+| File | Description |
+|------|-------------|
+| `draft-nennemann-wimse-execution-context-00.md` | The Internet-Draft in kramdown-rfc markdown format |
+| `master-prompt.md` | Design rationale, iteration plan, and reference material |
+
+## Building the draft
+
+The draft is authored in [kramdown-rfc](https://github.com/cabo/kramdown-rfc) markdown and compiled via the standard IETF toolchain.
+
+### Prerequisites
+
+```bash
+# Ruby (kramdown-rfc is a Ruby gem)
+# On macOS with Homebrew:
+brew install ruby
+
+# kramdown-rfc
+gem install kramdown-rfc
+
+# xml2rfc (Python tool for rendering)
+pip install xml2rfc
+```
+
+### Compile
+
+```bash
+# One-step build (markdown -> XML -> text + HTML)
+kdrfc draft-nennemann-wimse-execution-context-00.md
+
+# Or step by step:
+kramdown-rfc2629 draft-nennemann-wimse-execution-context-00.md \
+  > draft-nennemann-wimse-execution-context-00.xml
+
+xml2rfc draft-nennemann-wimse-execution-context-00.xml --text
+xml2rfc draft-nennemann-wimse-execution-context-00.xml --html
+```
+
+### Output files
+
+After building, you will have:
+
+- `draft-nennemann-wimse-execution-context-00.xml` -- canonical XML (for IETF datatracker submission)
+- `draft-nennemann-wimse-execution-context-00.txt` -- plain text rendering
+- `draft-nennemann-wimse-execution-context-00.html` -- HTML rendering
+
+## Submitting to the IETF
+
+Upload the generated `.xml` file at https://datatracker.ietf.org/submit/
+
+## Author
+
+Christian Nennemann
+Independent Researcher
+ietf@nennemann.de
+
+## License
+
+This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79.