Add postgres container for development

server/.env.example

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+DB_PASSWORD=
+DB_USER=
+DB_HOST=

server/README.md

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+# Personal Tracker Server
+
+The server!
+
+## Developer Setup

server/compose-dev.yaml

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+# Docker Compose for Development Machines
+
+services:
+  postgres:
+    container_name: personal-tracker-dev-db
+    image: postgres:16
+    ports:
+      - 127.0.0.1:5432:5432
+    volumes:
+      - ./dev-db/postgres:/var/lib/postgresql/data
+    environment:
+      POSTGRES_USER: "${DB_USER}"
+      POSTGRES_PASSWORD: "${DB_PASSWORD}"