docs: video contest page (#427)

Co-authored-by: Oleg Kalachev <okalachev@gmail.com>

docs/en/SUMMARY.md

@@ -100,6 +100,7 @@
   * [CopterHack-2019](copterhack2019.md)
   * [CopterHack-2018](copterhack2018.md)
   * [CopterHack-2017](copterhack2017.md)
+  * [Video contest](video_contest.md)
 * [Clover-based projects](projects.md)
   * [Autonomous Multirotor Landing System (AMLS)](amls.md)
   * [Drone show](clever-show.md)

docs/en/video_contest.md

@@ -0,0 +1,25 @@
+# Contest for the best educational video on assembly and configuration
+
+Requirements:
+
+- the video contains the entire process of assembling and configuring the Clover 4.2 drone kit: from opening the box with components to flying the copter in Position mode using ArUco markers;
+- the video is uploaded to YouTube and is public accessible;
+- the video contains voice-over in English;
+- the video lasts from 6 to 60 minutes.
+
+Dates of the contest: February 12 – December 13, 2021.
+
+## Prizes
+
+- 🥇 1st place: $500 (USD).
+- 🥈 2nd place: $300 (USD).
+- 🥉 3rd place: $200 (USD).
+
+## Results
+
+|Place|Participant|Link to the video|
+|:-:|-|-|
+|1|🇷🇺 Philipp Batalin|https://www.youtube.com/watch?v=f0rpdulOSEk|
+|2|🇮🇹 Sara Pettinari|https://www.youtube.com/watch?v=PxxfyVH6RRA|
+|3|🇲🇾 Kai Feng Chew|https://www.youtube.com/watch?v=skgSwFle6Ms|
+|3|🇰🇿 Nikita Lobanov|https://www.youtube.com/watch?v=93b1epEM3SQ|