[FL-1906] Documentation: add Doxyfile, prepare sources for doxygen. (#741)

* Documentation: add Doxyfile, prepare sources for doxygen.

* Update ReadMe and remove obsolete CLA

* Add contribution guide

* Contributing: update text

* Correct spelling

applications/gui/modules/text_input.h

@@ -1,44 +1,59 @@
+/**
+ * @file text_input.h
+ * GUI: TextInput keybord view module API
+ */
+
 #pragma once
+
 #include <gui/view.h>
 
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-/* Text input anonymous structure */
+/** Text input anonymous structure */
 typedef struct TextInput TextInput;
 typedef void (*TextInputCallback)(void* context);
 
-/** Allocate and initialize text input
+/** Allocate and initialize text input 
+ * 
  * This text input is used to enter string
- * @return TextInput instance
+ *
+ * @return     TextInput instance
  */
 TextInput* text_input_alloc();
 
 /** Deinitialize and free text input
- * @param text_input - TextInput instance
+ *
+ * @param      text_input  TextInput instance
  */
 void text_input_free(TextInput* text_input);
 
-/** Clean text input view
- * Note: this function does not free memory
- * @param text_input - Text input instance
+/** Clean text input view Note: this function does not free memory
+ *
+ * @param      text_input  Text input instance
  */
 void text_input_clean(TextInput* text_input);
 
 /** Get text input view
- * @param text_input - TextInput instance
- * @return View instance that can be used for embedding
+ *
+ * @param      text_input  TextInput instance
+ *
+ * @return     View instance that can be used for embedding
  */
 View* text_input_get_view(TextInput* text_input);
 
 /** Set text input result callback
- * @param text_input - TextInput instance
- * @param callback - callback fn
- * @param callback_context - callback context
- * @param text_buffer - pointer to YOUR text buffer, that we going to modify
- * @param text_buffer_size - YOUR text buffer size in bytes. Max string length will be text_buffer_size - 1.
- * @param clear_default_text - clear text from text_buffer on first OK event
+ *
+ * @param      text_input          TextInput instance
+ * @param      callback            callback fn
+ * @param      callback_context    callback context
+ * @param      text_buffer         pointer to YOUR text buffer, that we going
+ *                                 to modify
+ * @param      text_buffer_size    YOUR text buffer size in bytes. Max string
+ *                                 length will be text_buffer_size-1.
+ * @param      clear_default_text  clear text from text_buffer on first OK
+ *                                 event
  */
 void text_input_set_result_callback(
     TextInput* text_input,
@@ -49,8 +64,9 @@ void text_input_set_result_callback(
     bool clear_default_text);
 
 /** Set text input header text
- * @param text_input - TextInput instance
- * @param text - text to be shown
+ *
+ * @param      text_input  TextInput instance
+ * @param      text        text to be shown
  */
 void text_input_set_header_text(TextInput* text_input, const char* text);