Add JSON-RPC sections to README.md.

README.md

@@ -46,6 +46,9 @@ fast! We mean it.
    [Compare **JSight API** with **Open API**](#scroll--jsight-api-language).  
    [Compare **JSight Schema** with **JSON Schema**](#scroll--jsight-schema-language).
 
+Supported standards: [HTTP REST](#scroll--jsight-api-language), [JSON-RPC
+2.0](#json-rpc-20-new-feature).
+
 <div>  
   &nbsp; 
 </div>
@@ -136,8 +139,8 @@ https://editor.jsight.io.
 
 ## :scroll: &nbsp; JSight API language
 
-The JSight API language allows you to specify REST APIs with incredible speed and convenience. More
-information can be found in the [Quick
+The JSight API language allows you to specify REST and JSON-RPC APIs with incredible speed and
+convenience. More information can be found in the [Quick
 Tutorial](https://jsight.io/docs/jsight-api-0-3-quick-tutorial) or in the [language
 specification](./versions/JSight%20API/). Here we give examples of the same
 API described using JSight API and Open API.
@@ -1286,6 +1289,130 @@ We did not describe this API in OpenAPI. It is too complicated and very long…
 
 </details>
 
+#### JSON-RPC 2.0. New Feature!
+
+<details><summary>Example 9. JSON-RPC 2.0</summary>
+
+<table align="center">
+<thead>
+<tr>
+  <th width="50%">
+    JSight API 0.3
+  </th>
+  <th>
+    OpenRPC 1.2.1
+  </th>
+</tr>
+</thead>
+<tbody>
+<tr valign="top">
+<td>
+
+```
+JSIGHT 0.3
+URL / 
+  Protocol json-rpc-2.0
+  Method listPets // List all pets
+    Params
+      [
+        20 // Limit (how many items to return).
+      ]
+    Result
+      [       // An array of pets
+        {     // Pet
+          "id": 123,
+          "name": "Tom"
+        }
+      ]
+
+```
+
+The JSON-RPC API is as simple to describe as the REST API.
+
+More about JSON-RPC 2.0 support: [Quick Tutorial. JSON-RPC 2.0
+support](https://jsight.io/docs/jsight-api-0-3-quick-tutorial/lesson10).
+
+<div align="center">
+
+:star: **Star us on GitHub — it motivates us a lot!**
+
+</div>
+
+</td>
+<td>
+
+```
+{
+  "openrpc": "1.2.1",
+  "info": {
+    "version": "",
+    "title": ""
+  },
+  "methods": [
+    {
+      "name": "listPets",
+      "description": "List all pets",
+      "params": [
+        {
+          "name": "limit",
+          "description": "How many items to return",
+          "schema": {
+            "type": "integer"
+          }
+        }
+      ],
+      "result": {
+        "name": "pets",
+        "description": "An array of pets",
+        "schema": {
+          "type": "array",
+          "items": {
+            "title": "Pet",
+            "type": "object",
+            "properties": {
+              "id": {
+                "type": "integer"
+              },
+              "name": {
+                "type": "string"
+              }
+            }
+          }
+        }
+      },
+      "examples": [
+        {
+          "name": "listPetExample",
+          "description": "List pet example",
+          "params": [
+            {
+              "name": "limit",
+              "value": 20
+            }
+          ],
+          "result": {
+            "name": "listPetResultExample",
+            "value": [
+              {
+                "id": 123,
+                "name": "Tom"
+              }
+            ]
+          }
+        }
+      ]
+    }
+  ]
+}
+```
+
+</td>
+</tr>
+</tbody>
+</table>
+
+</details>
+
 <div>  
   &nbsp; 
 </div>
@@ -1725,8 +1852,7 @@ Read more about built-in data types in the JSight Schema Language Specification,
 
 ## :date: &nbsp; Roadmap
 
-- July 2022 — Support for the JSON-RPC 2.0 standard.
-- November 2022 — Support for other types of API: gRPC, Kafka, RabbitMQ, WebSocket.
+- Support for other types of API: gRPC, Kafka, RabbitMQ, WebSocket.
 
 If you have ideas and suggestions, please write to us: