📝 add more API documentation

doc/mkdocs/docs/api/basic_json/array.md

@@ -0,0 +1,55 @@
+# basic_json::array
+
+```cpp
+static basic_json array(initializer_list_t init = {});
+```
+
+Creates a JSON array value from a given initializer list. That is, given a list of values `a, b, c`, creates the JSON
+value `#!json [a, b, c]`. If the initializer list is empty, the empty array `#!json []` is created.
+
+## Parameters
+
+`init` (in)
+:   initializer list with JSON values to create an array from (optional)
+
+## Return value
+
+JSON array value
+
+## Exception safety
+
+Strong guarantee: if an exception is thrown, there are no changes in the JSON value.
+
+## Complexity
+
+Linear in the size of `init`.
+
+## Notes
+
+This function is only needed to express two edge cases that cannot be realized with the initializer list constructor
+([`basic_json(initializer_list_t, bool, value_t)`](basic_json.md)). These cases are:
+
+1. creating an array whose elements are all pairs whose first element is a string -- in this case, the initializer list
+   constructor would create an object, taking the first elements as keys
+2. creating an empty array -- passing the empty initializer list to the initializer list constructor yields an empty
+   object
+
+## Examples
+
+??? example
+
+    The following code shows an example for the `array` function.
+
+    ```cpp
+    --8<-- "examples/array.cpp"
+    ```
+    
+    Output:
+    
+    ```json
+    --8<-- "examples/array.output"
+    ```
+
+## Version history
+
+- Added in version 1.0.0.