Reorganize directories (#3462)

* 🚚 move files
* 🚚 rename doc folder to docs
* 🚚 rename test folder to tests

docs/mkdocs/docs/api/basic_json/object.md

@@ -0,0 +1,63 @@
+# <small>nlohmann::basic_json::</small>object
+
+```cpp
+static basic_json object(initializer_list_t init = {});
+```
+
+Creates a JSON object value from a given initializer list. The initializer lists elements must be pairs, and their first
+elements must be strings. If the initializer list is empty, the empty object `#!json {}` is created.
+
+## Parameters
+
+`init` (in)
+:   initializer list with JSON values to create an object from (optional)
+
+## Return value
+
+JSON object value
+
+## Exception safety
+
+Strong guarantee: if an exception is thrown, there are no changes in the JSON value.
+
+## Exceptions
+
+Throws [`type_error.301`](../../home/exceptions.md#jsonexceptiontype_error301) if `init` is not a list of pairs whose
+first elements are strings. In this case, no object can be created. When such a value is passed to
+`basic_json(initializer_list_t, bool, value_t)`, an array would have been created from the passed initializer list
+`init`. See example below.
+
+## Complexity
+
+Linear in the size of `init`.
+
+## Notes
+
+This function is only added for symmetry reasons. In contrast to the related function `array(initializer_list_t)`, there
+are no cases which can only be expressed by this function. That is, any initializer list `init` can also be passed to
+the initializer list constructor `basic_json(initializer_list_t, bool, value_t)`.
+    
+## Examples
+
+??? example
+
+    The following code shows an example for the `object` function.
+
+    ```cpp
+    --8<-- "examples/object.cpp"
+    ```
+    
+    Output:
+    
+    ```json
+    --8<-- "examples/object.output"
+    ```
+
+## See also
+
+- [`basic_json(initializer_list_t)`](basic_json.md) - create a JSON value from an initializer list
+- [`array`](array.md) - create a JSON array value from an initializer list
+
+## Version history
+
+- Added in version 1.0.0.