Created nlohmann::basic_json::get_allocator (markdown)

nlohmann::basic_json::get_allocator.md

@@ -0,0 +1,19 @@
+```cpp
+static allocator_type get_allocator();
+```
+
+## Description
+
+Returns the allocator associated with the container.
+
+## Parameters
+
+None.
+
+## Return value
+
+the associated allocator
+
+## Complexity
+
+Constant.