Add JSON parse source gen (#9)

ConsumePlugin/JsonRecord.fs

@@ -0,0 +1,28 @@
+namespace ConsumePlugin
+
+open System.Text.Json.Serialization
+
+module Literals =
+    [<Literal>]
+    let something = "something"
+
+[<MyriadPlugin.JsonParse>]
+type InnerType =
+    {
+        [<JsonPropertyName(Literals.something)>]
+        Thing : string
+    }
+
+/// My whatnot
+[<MyriadPlugin.JsonParse>]
+type JsonRecordType =
+    {
+        /// A thing!
+        A : int
+        /// Another thing!
+        [<JsonPropertyName "another-thing">]
+        B : string
+        [<System.Text.Json.Serialization.JsonPropertyName "hi">]
+        C : int list
+        D : InnerType
+    }