📝 documented JSON Merge Patch (RFC 7386)

README.md

@@ -21,6 +21,7 @@
   - [STL-like access](#stl-like-access)
   - [Conversion from STL containers](#conversion-from-stl-containers)
   - [JSON Pointer and JSON Patch](#json-pointer-and-json-patch)
+  - [JSON Merge Patch](#json-merge-patch)
   - [Implicit conversions](#implicit-conversions)
   - [Conversions to/from arbitrary types](#arbitrary-types-conversions)
   - [Binary formats (CBOR, MessagePack, and UBJSON)](#binary-formats-cbor-messagepack-and-ubjson)
@@ -456,6 +457,37 @@ json::diff(j_result, j_original);
 // ]
 ```
 
+### JSON Merge Patch
+
+The library supports **JSON Merge Patch** ([RFC 7386](https://tools.ietf.org/html/rfc7386)) as a patch format. Instead of using JSON Pointer (see above) to specify values to be manipulated, it describes the changes using a syntax that closely mimics the document being modified.
+
+```cpp
+// a JSON value
+json j_document = R"({
+  "a": "b",
+  "c": {
+    "d": "e",
+    "f": "g"
+  }
+})"_json;
+
+// a patch
+json j_patch = R"({
+  "a":"z",
+  "c": {
+    "f": null
+  }
+})"_json;
+
+// apply the patch
+j_original.merge_patch(j_patch);
+// {
+//  "a": "z",
+//  "c": {
+//    "d": "e"
+//  }
+// }
+```
 
 ### Implicit conversions