basic processor documentation layout

src/content/docs/processors/string/decode.md

@@ -0,0 +1,13 @@
+---
+title: Decode
+sidebar:
+    order: 1
+---
+The string decode processor takes a array of bytes and turn it into string. This processor will return an error if the message being processed is not an array of bytes.
+
+- **type**: `string.decode`
+
+### Example
+```
+- type: string.decode
+```