chore: import upstream snapshot with attribution

config/source/nats/README.md

@@ -0,0 +1,56 @@
+# Nats Source
+
+The nats source reads config from nats key/values
+
+## Nats Format
+
+The nats source expects keys under the default bucket `default` default key `micro_config`
+
+Values are expected to be json
+
+```
+nats kv put default micro_config '{"nats": {"address": "10.0.0.1", "port": 8488}}'
+```
+
+```
+conf.Get("nats")
+```
+
+## New Source
+
+Specify source with data
+
+```go
+natsSource := nats.NewSource(
+	nats.WithUrl("127.0.0.1:4222"),
+	nats.WithBucket("my_bucket"),
+	nats.WithKey("my_key"),
+)
+```
+
+## Load Source
+
+Load the source into config
+
+```go
+// Create new config
+conf := config.NewConfig()
+
+// Load nats source
+conf.Load(natsSource)
+```
+
+## Watch
+
+```go
+wh, _ := natsSource.Watch()
+
+for {
+	v, err := watcher.Next()
+	if err != nil {
+		log.Fatalf("err %v", err)
+	}
+
+	log.Infof("data %v", string(v.Data))
+}
+```