Handle SIGTERM. Add docker-compose.yml (#59)

* docker-compsoe

* remove statsd config

* readme

docker-compose.yml

@@ -0,0 +1,16 @@
+version: "3"
+services:
+  postgres:
+    image: postgres:13
+    environment:
+      POSTGRES_PASSWORD: postgres
+      POSTGRES_HOST_AUTH_METHOD: md5
+  pgcat:
+    build: .
+    command:
+      - "pgcat"
+      - "/etc/pgcat/pgcat.toml"
+    volumes:
+      - "${PWD}/examples/docker/pgcat.toml:/etc/pgcat/pgcat.toml"
+    ports:
+      - "6432:6432"