added small info in README, moved config

README.md

@@ -13,6 +13,11 @@ Usage of magnify:
         yaml file config path (default "config.yaml")
 ```
 
+## Docker usage 
+```bash
+docker run -v ./config.yaml:/config.yaml -d w1n2k/magnify:1.0.0 
+```
+
 ## Example configuration
 Please look at [Expr](https://expr-lang.org/docs/getting-started) documentation for expressions.
 

config.example.yaml

@@ -0,0 +1,8 @@
+prometheus:
+  addr: "http://localhost:4000"
+expressions:
+  - name: goroutines
+    query: sum(rate(go_gc_duration_seconds{app_kubernetes_io_name="game-server"}[5m])) by (service)
+    expr: "float(query_result[0].Value.String()) >= 0.0 ? 'operational': 'error'"
+http:
+  addr: ":9999"