Improve API calls for categories

docs/api-json-rpc.markdown

@@ -889,39 +889,172 @@ Response example:
 ### createCategory
 
 - Purpose: **Create a new category**
-- Parameters: Key/value pair composed of the **name** (string), **project_id** (integer)
+- Parameters:
+- **project_id** (integer, required)
+    - **name** (string, required, must unique for the given project)
 - Result on success: **true**
 - Result on failure: **false**
 
+Request example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "method": "createCategory",
+    "id": 541909890,
+    "params": {
+        "name": "Super category",
+        "project_id": 1
+    }
+}
+```
+
+Response example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "id": 541909890,
+    "result": true
+}
+```
+
 ### getCategory
 
 - Purpose: **Get category information**
-- Parameters: **category_id** (integer)
+- Parameters:
+    - **category_id** (integer, required)
 - Result on success: **category properties**
 - Result on failure: **null**
 
+Request example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "method": "getCategory",
+    "id": 203539163,
+    "params": {
+        "category_id": 1
+    }
+}
+```
+
+Response example:
+
+```json
+{
+
+    "jsonrpc": "2.0",
+    "id": 203539163,
+    "result": {
+        "id": "1",
+        "name": "Super category",
+        "project_id": "1"
+    }
+}
+```
+
 ### getAllCategories
 
 - Purpose: **Get all available categories**
-- Parameters: **project_id** (integer)
+- Parameters:
+    - **project_id** (integer, required)
 - Result on success: **List of categories**
 - Result on failure: **false**
 
+Request example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "method": "getAllCategories",
+    "id": 1261777968,
+    "params": {
+        "project_id": 1
+    }
+}
+```
+
+Response example:
+
+```json
+
+    "jsonrpc": "2.0",
+    "id": 1261777968,
+    "result": [
+        {
+            "id": "1",
+            "name": "Super category",
+            "project_id": "1"
+        }
+    ]
+}
+```
+
 ### updateCategory
 
 - Purpose: **Update a category**
-- Parameters: Key/value pair composed of the **id** (integer), **name** (string), **project_id** (integer)
+- Parameters:
+    - **id** (integer, required)
+    - **name** (string, required)
 - Result on success: **true**
 - Result on failure: **false**
 
+Request example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "method": "updateCategory",
+    "id": 570195391,
+    "params": {
+        "id": 1,
+        "name": "Renamed category"
+    }
+}
+```
+
+Response example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "id": 570195391,
+    "result": true
+}
+```
+
 ### removeCategory
 
 - Purpose: **Remove a category**
-- Parameters: **category_id** (integer)
+- Parameters:
+    - **category_id** (integer)
 - Result on success: **true**
 - Result on failure: **false**
 
+Request example:
 
+```json
+{
+    "jsonrpc": "2.0",
+    "method": "removeCategory",
+    "id": 88225706,
+    "params": {
+        "category_id": 1
+    }
+}
+```
+
+Response example:
+
+```json
+{
+    "jsonrpc": "2.0",
+    "id": 88225706,
+    "result": true
+}
+```
 
 
 ### createComment