insert_event (#1)

Option to insert events seems to work.

Reviewed-on: bjoernf/ics_analyzer#1
Co-authored-by: bjoernf <bjoern.foersterling@web.de>
Co-committed-by: bjoernf <bjoern.foersterling@web.de>

src/insert_event.h

@@ -0,0 +1,8 @@
+#pragma once
+
+void insert_event(char *file_name);
+void seek_cal_end(int fd);
+int binary_user_choice();
+void get_dtstart_dtend(char input_buffer[], int all_day_event, char *start_or_end);
+void form_dtstart_string(char dtstart_buffer[], char time_zone[]);
+void form_dtend_string(char dtend_buffer[], char time_zone[]);