Add "Hasura - No Database" to use with external database (#210)

* Create hasura-only.json

* Add hasura-only.png

* fix the json format with prettier

public/v2/apps/hasura-only.json

@@ -0,0 +1,47 @@
+{
+    "captainVersion": "2",
+    "documentation": "Hasura GraphQL Engine",
+    "displayName": "Hasura - No Database",
+    "description": "Instant realtime GraphQL APIs on any Postgres application, existing or new",
+    "dockerCompose": {
+        "version": "3.6",
+        "services": {
+            "$$cap_appname": {
+                "image": "hasura/graphql-engine:$$cap_hasura_version",
+                "containerHttpPort": "8080",
+                "restart": "always",
+                "environment": {
+                    "HASURA_GRAPHQL_DATABASE_URL": "$$cap_database_url",
+                    "HASURA_GRAPHQL_ENABLE_CONSOLE": "true",
+                    "HASURA_GRAPHQL_ADMIN_SECRET": "$$cap_admin_secret",
+                    "HASURA_GRAPHQL_ENABLED_LOG_TYPES": "startup, http-log, webhook-log, websocket-log, query-log"
+                }
+            }
+        }
+    },
+    "instructions": {
+        "end": "Hasura is deployed and available as $$cap_appname. \n\n IMPORTANT: It will take up to 2 minutes for Hasura to be ready. Before that, you might see 502 error page.\n",
+        "start": "Instant Realtime GraphQL on Postgres with web admin console."
+    },
+    "variables": [
+        {
+            "defaultValue": "v1.2.2",
+            "description": "Check out their GitHub page for their latest version https://github.com/hasura/graphql-engine",
+            "id": "$$cap_hasura_version",
+            "label": "Hasura Version",
+            "validRegex": "/^([^\\s^\\/])+$/"
+        },
+        {
+            "description": "The admin secret gives you access to the console.",
+            "id": "$$cap_admin_secret",
+            "label": "Hasura admin secret(password)",
+            "validRegex": "/^(?=.*\\d).{10,}$/"
+        },
+        {
+            "id": "$$cap_database_url",
+            "label": "Postgres Connection URL",
+            "description": "postgres://username:password@host/database",
+            "validRegex": "/postgres://.+/.+/"
+        }
+    ]
+}