Add API documentation for jerry_create_string_from_utf8 and jerry_create_string_sz_from_utf8 functions. (#1444)

JerryScript-DCO-1.0-Signed-off-by: Robert Sipka rsipka.uszeged@partner.samsung.com

docs/02.API-REFERENCE.md

@@ -1981,6 +1981,80 @@ jerry_create_string_sz (const jerry_char_t *str_p,
 
 - [jerry_create_string](#jerry_create_string)
 
+## jerry_create_string_from_utf8
+
+**Summary**
+
+Create string from a valid UTF8 string.
+
+*Note*: The difference from [jerry_create_string](#jerry_create_string) is that it accepts utf-8 string instead of cesu-8 string.
+
+**Prototype**
+
+```c
+jerry_value_t
+jerry_create_string_from_utf8 (const jerry_char_t *str_p);
+```
+
+- `str_p` - pointer to string
+- return value - value of the created string
+
+**Example**
+
+```c
+{
+  const jerry_char_t char_array[] = "a string";
+  jerry_value_t string_value  = jerry_create_string_from_utf8 (char_array);
+
+  ... // usage of string_value
+
+  jerry_release_value (string_value);
+}
+```
+
+**See also**
+
+- [jerry_create_string_sz_from_utf8](#jerry_create_string_sz_from_utf8)
+
+
+## jerry_create_string_sz_from_utf8
+
+**Summary**
+
+Create string from a valid UTF8 string.
+
+*Note*: The difference from [jerry_create_string_sz](#jerry_create_string_sz) is that it accepts utf-8 string instead of cesu-8 string.
+
+**Prototype**
+
+```c
+jerry_value_t
+jerry_create_string_sz (const jerry_char_t *str_p,
+                        jerry_size_t str_size)
+```
+
+- `str_p` - pointer to string
+- `str_size` - size of the string
+- return value - value of the created string
+
+**Example**
+
+```c
+{
+  const jerry_char_t char_array[] = "a string";
+  jerry_value_t string_value  = jerry_create_string_sz_from_utf8 (char_array,
+                                                                  strlen ((const char *) char_array));
+
+  ... // usage of string_value
+
+  jerry_release_value (string_value);
+}
+
+```
+
+**See also**
+
+- [jerry_create_string_from_utf8](#jerry_create_string_from_utf8)
 
 ## jerry_create_undefined