Merge branch 'main' into 'main'

update readme

See merge request eclipse/xfsc/libraries/microservice/core!6

README.md

@@ -9,6 +9,19 @@ type exampleConfig struct {
 }
 ````
 
+you can also define extra structs inside the config struct:
+````go
+type exampleConfig struct {
+    core.BaseConfig `mapstructure:",squash"`
+    TestValue       string `mapstructure:"testValue"`
+    OAuth           struct {
+        ServerUrl    string `mapstructure:"serverUrl"`
+        ClientId     string `mapstructure:"clientId"`
+        ClientSecret string `mapstructure:"clientSecret"`
+    } `mapstructure:"oAuth"`
+}
+````
+
 2. Create global config struct instance and load config with LoadConfig() function. Provide Prefix for ENV variables and map with default values
 ````go
 var ExampleConfig exampleConfig