Created nlohmann::basic_json::clear (markdown)

nlohmann::basic_json::clear.md

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+```cpp
+void clear();
+```
+
+## Description
+
+Removes all elements from the container. The resulting value depends on the different value types and is defined as follows:
+
+| Value type | JSON value            |
+| ---------- | --------------------- |
+| null       | `null` |
+| boolean    | `false`               |
+| string     | `""`               |
+| number     | `0`               |
+| object     | `{}` |
+| array      | `[]`  |
+
+## Parameters
+
+None.
+
+## Return value
+
+None.
+
+## Complexity
+
+Linear in the size of the container.
+
+## Exceptions
+
+None. The function's noexcept-specification is `noexcept`.