add: API server(#422)

Add an example of api server so that devs can quickly get up a bot running along with its api

examples/api_server/docker-compose.yml

@@ -0,0 +1,13 @@
+version: "3.9"
+
+services:
+  backend:
+    container_name: embedchain_api
+    restart: unless-stopped
+    build:
+      context: .
+      dockerfile: Dockerfile
+    env_file:
+      - variables.env
+    ports:
+      - "5000:5000"