Created nlohmann::basic_json::operator= (markdown)

nlohmann::basic_json::operator=.md

@@ -0,0 +1,30 @@
+```cpp
+reference& operator=(basic_json other)
+```
+
+## Description
+
+Replaces the contents with a copy of `other`. In case `other` is an rvalue, its value is moved.
+
+## Parameters
+
+- `other`: container to copy
+
+## Return value
+
+`*this`
+
+## Complexity
+
+Linear in the size of `other`. If `other` is an rvalue, the operation has constant complexity.
+
+## Exceptions
+
+The function's noexcept-specification is:
+
+```cpp
+std::is_nothrow_move_constructible<value_t>::value and
+std::is_nothrow_move_assignable<value_t>::value and
+std::is_nothrow_move_constructible<json_value>::value and
+std::is_nothrow_move_assignable<json_value>::value
+```