add unlicense as license of project

* use unlicense to put work into public domain and not care for anything
* https://unlicense.org/

RandomVideo.sh

@@ -1,4 +1,5 @@
 #!/bin/sh
+# SPDX-License-Identifier: Unlicense
 
 folder=/mnt/video
 player=omxplayer

UNLICENSE.txt

@@ -0,0 +1,25 @@
+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <https://unlicense.org>
+

buzzer.sh

@@ -1,4 +1,5 @@
 #!/bin/sh
+# SPDX-License-Identifier: Unlicense
 
 # set gpio number
 gpio=0

crontab

@@ -1,4 +1,5 @@
+# SPDX-License-Identifier: Unlicense
 # user: pi
 
 */15 * * * * /home/pi/RandomVideo/RandomVideo.sh cron
-@reboot /home/pi/RandomVideo/buzzer.sh &
+@reboot /home/pi/RandomVideo/buzzer.sh &

fstab

@@ -1 +1,2 @@
-/dev/sda1	/mnt/video	vfat	defaults,users,ro	0	1
+# SPDX-License-Identifier: Unlicense
+/dev/sda1	/mnt/video	vfat	defaults,users,ro	0	1