Add readme about docker, remove postgres.conf from git

.gitignore

@@ -1,4 +1,5 @@
 src/main/resources/application.conf
+src/main/resources/postgres.conf
 
 target/
 project/target/

README.md

@@ -36,3 +36,12 @@ npm run dev
 - Docker
 - Shell script
 - Fly.io
+
+
+## Docker
+```
+docker pull postgres
+docker run --name local-postgres -e POSTGRES_PASSWORD=mysecretpassword -p 5432:5432 -d postgres
+docker stop local-postgres
+docker start local-postgres
+```

src/main/resources/postgres.conf

@@ -1,3 +0,0 @@
-username = "postgres"
-password = "mysecretpassword"
-url = "jdbc:postgresql://localhost:5432/weather-tool"