Add project overview and collaborators

README.md

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+# Browsec
+
+Browsec is an independently governed Firefox downstream exploring plural,
+user-controlled trust for TLS certificates and browser extensions. It treats
+the conventional global Web PKI as one trust provider among several and allows
+narrowly scoped local and community trust decisions.
+
+The project is currently developing **TrustLab**, a browser-neutral JavaScript
+testbed for trust plugins, immutable TLS facts, append-only decision journals,
+and scoped Boolean trust verdicts.
+
+## Project documents
+
+- [Coarse-grained concept](CONCEPT.md)
+- [Architecture decisions](ARCHITECTURE.md)
+- [Certificate Investigator design](DESIGN.md)
+- [TrustLab](trustlab/README.md)
+
+## Collaborators
+
+- **sergeych** — project creator, security architecture, and implementation
+- **Codex (OpenAI)** — AI design and implementation collaborator
+