add config

config/source/memory/README.md

@@ -0,0 +1,44 @@
+# Memory Source
+
+The memory source provides in-memory data as a source
+
+## Memory Format
+
+The expected data format is json
+
+```json
+data := []byte(`{
+    "hosts": {
+        "database": {
+            "address": "10.0.0.1",
+            "port": 3306
+        },
+        "cache": {
+            "address": "10.0.0.2",
+            "port": 6379
+        }
+    }
+}`)
+```
+
+## New Source
+
+Specify source with data
+
+```go
+memorySource := memory.NewSource(
+	memory.WithData(data),
+)
+```
+
+## Load Source
+
+Load the source into config
+
+```go
+// Create new config
+conf := config.NewConfig()
+
+// Load file source
+conf.Load(memorySource)
+```