chore: remove stray .txt - update readme to .yml vs .yaml

Author: grthomson

.gitignore

@@ -0,0 +1,14 @@
+# Rust build artifacts
+/target/
+**/*.rs.bk
+
+# Local dev files
+*.env
+*.log
+
+# Docker stuff
+db-data/
+docker-rust-kubernetes.yaml
+
+# Git
+.DS_Store

readme.md

@@ -1,7 +1,42 @@
 # docker-rust-postgres
 
-[![CI](https://github.com/grthomson/docker-rust-postgres/actions/workflows/main.yaml/badge.svg?branch=main)](https://github.com/grthomson/docker-rust-postgres/actions/workflows/main.yaml)
+[![CI](https://github.com/grthomson/docker-rust-postgres/actions/workflows/main.yml/badge.svg?branch=main)](https://github.com/grthomson/docker-rust-postgres/actions/workflows/main.yml)
 [![Docker Pulls](https://img.shields.io/docker/pulls/grthomson/docker-rust-postgres.svg)](https://hub.docker.com/r/grthomson/docker-rust-postgres)
 [![Image Size](https://img.shields.io/docker/image-size/grthomson/docker-rust-postgres/latest)](https://hub.docker.com/r/grthomson/docker-rust-postgres/tags)
 
 Minimal Rust + PostgreSQL microservice using Actix Web. Containerised with Docker; includes Docker Compose and CI to Docker Hub.
+
+## Quick start (Compose)
+
+```bash
+docker compose up --build
+# then visit:
+# http://localhost:8000/users
+```
+
+## Run from Docker Hub
+
+Image is published on every push to main:
+
+```docker.io/grthomson/docker-rust-postgres:latest```
+
+Run it against a local Postgres:
+
+```
+docker run -p 8000:8000 \
+  -e PG_HOST=host.docker.internal \
+  -e PG_DBNAME=example \
+  -e PG_USER=postgres \
+  -e PG_PASSWORD=mysecretpassword \
+  grthomson/docker-rust-postgres:latest
+```
+
+## Endpoints
+
+```GET /users``` – list users (migration seeds a ```root``` user)
+
+```GET /healthz``` – health check 
+
+## CI/CD
+
+- GitHub Actions builds & pushes Docker image to Docker Hub on each push to main.