Update Procfile.

Usage: `gem install foreman` then `foreman start`.

Procfile

@@ -1,2 +1,14 @@
-unicorn: bin/rails server -p 3000
-jobs: bin/rake jobs:work
+# Usage: run `gem install foreman` then run `foreman start`. This will start
+# all the processes needed to run Danbooru in a dev environment.
+#
+# Uncomment the `db` line to start a database (assuming you have Docker and
+# don't have another database already running).
+#
+# http://blog.daviddollar.org/2011/05/06/introducing-foreman.html
+# https://github.com/ddollar/foreman
+
+web: bin/rails server
+worker: bin/rails jobs:work
+clock: bin/rails danbooru:cron
+webpack-dev-server: bin/webpack-dev-server
+# db: docker run --rm -it --name danbooru-postgres --shm-size=8g -p 5432:5432 -e POSTGRES_USER=danbooru - e POSTRES_HOST_AUTH_METHOD=trust -v danbooru-postgres:/var/lib/postgresql/data evazion/postgres