docs: Add functions listing in the README.md

Author: none

README.md

@@ -5,7 +5,7 @@ This library is header-only and follows the [stb-style](https://github.com/nothi
 For more information about this style read [this](https://github.com/nothings/stb/blob/master/docs/stb_howto.txt).
 
 > [!NOTE]  
-> This library uses C99 features (inline functions). 
+> This library uses **C99** features ([Inline functions](https://en.wikipedia.org/wiki/Inline_function)). 
 
 ```c
 
@@ -53,3 +53,52 @@ No linking or stuff like that is needed.
 >   printf(STRING_VIEW_FORMAT "\n", STRING_VIEW_ARG(sv));
 > }
 > ```
+
+## Documentation
+
+The full documentation is situated inside the [string_view.h](./string_view.h) file.
+
+## Implemented functions
+
+| Function                     | Brief                                                                  |
+|------------------------------|------------------------------------------------------------------------|
+| `new_string_view`            | Creates a new string view from a character array and length            |
+| `new_string_view_from_cstr`  | Creates a new string view from a null-terminated character string      |
+| `string_view_data`           | Returns a pointer to the underlying character data of the string view  |
+| `string_view_size`           | Returns the length of the string view                                  |
+| `string_view_at`             | Returns the character at the specified index in the string view        |
+| `string_view_front`          | Returns the first character of the string view                         |
+| `string_view_back`           | Returns the last character of the string view                          |
+| `string_view_is_empty`       | Checks if the string view is empty                                     |
+| `string_view_trim_left`      | Trims whitespace characters from the beginning of a string view        |
+| `string_view_trim_right`     | Trims whitespace characters from the end of a string view              |
+| `string_view_trim`           | Trims whitespace characters from both ends of a string view            |
+| `string_view_remove_prefix`  | Removes a prefix of specified length from a string view                |
+| `string_view_remove_suffix`  | Removes a suffix of specified length from a string view                |
+| `string_view_swap`           | Swaps the contents of two string views                                 |
+| `string_view_copy`           | Copies a portion of a string view into a character array               |
+| `string_view_substr`         | Creates a new string view that is a substring of the given string view |
+| `string_view_compare`        | Compares two string views lexicographically                            |
+| `string_view_equal`          | Checks if two string views are equal                                   |
+| `string_view_starts_with`    | Checks if a string view starts with a given prefix                     |
+| `string_view_ends_with`      | Checks if a string view ends with a given suffix                       |
+| `string_view_find_char`      | Finds the first occurrence of a character in a string view             |
+| `string_view_find_substring` | Finds the first occurrence of a substring within a string view         |
+
+> [!NOTE]
+> **string_view_contains** is dependent on the C standard version.
+>
+> In **C11** is defined as a macro that uses `_Generic` to dispatch the correct implementation.
+> 
+> | Macro                            | Brief                                                |
+> |----------------------------------|------------------------------------------------------|
+> | `string_view_contains`           | Checks if a string view contains a specified element |
+>
+> In **C99**, two separate macros are defined for character and substring checks:
+>
+> | Macro                            | Brief                                                 |
+> |----------------------------------|-------------------------------------------------------|
+> | `string_view_contains_char`      | Checks if a string view contains a specific character |
+> | `string_view_contains_substring` | Checks if a string view contains a specific substring |
+>
+