Docker: Begin dockerization

.docker/env

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+MONGO_URL=mongodb://mongo:27017/fosscord?readPreference=secondaryPreferred

.docker/mongodb/mongod.conf

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+replication:
+    replSetName: "rs0"

.gitignore

@@ -1,2 +1,4 @@
 node_modules/
-.DS_STORE
+.DS_STORE
+.docker/data/*
+!.docker/data/.keep

docker-compose.yml

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+version: "3"
+services:
+    fosscord-gateway:
+        container_name: gateway
+        restart: always
+        build: gateway
+        ports:
+            - "3002:3002"
+        links:
+            - mongo
+        env_file: ./.docker/env
+    fosscord-api:
+        container_name: api
+        restart: always
+        build: api
+        ports:
+            - "3001:3001"
+    mongo:
+        container_name: mongo
+        image: mongo
+        volumes:
+            - ./.docker/data:/data/db
+            - ./.docker/mongodb/mongod.conf:/etc/mongod.conf
+        ports:
+            - "27017:27017"
+        command: ["-f", "/etc/mongod.conf"]