Announcements for nuScenes challenges at ICRA 2021 (nutonomy#577)

* Add description for ICRA 2021

* Change title to 6th AIDO, shift workshop name into description

* Use full name for 6th AIDO; add link for 6th AIDO

python-sdk/nuscenes/eval/detection/README.md

@@ -40,6 +40,13 @@ Any user that cannot attend the workshop (direct or via a representative) will b
 
 Click [here](https://eval.ai/web/challenges/challenge-page/356/overview) for the **EvalAI detection evaluation server**.
 
+### 6th AI Driving Olympics, ICRA 2021
+The fourth nuScenes detection challenge will be held at [ICRA 2021](http://www.icra2021.org/) as part of [The AI Driving Olympics: Evaluating Progress in Robotics through Standardized and Reproducible Benchmarks](https://driving-olympics.ai/).
+Submissions will be accepted from April 1 to May 26, 2021.
+The prizes will be awarded to submissions that outperform the previous state-of-the-art in their respective tracks.
+Results and winners will be announced at [The AI Driving Olympics: Evaluating Progress in Robotics through Standardized and Reproducible Benchmarks](https://driving-olympics.ai/).
+Note that this challenge uses the same [evaluation server](https://eval.ai/web/challenges/challenge-page/356/overview) as previous detection challenges.
+
 ### 5th AI Driving Olympics, NeurIPS 2020 
 The third nuScenes detection challenge will be held at [NeurIPS 2020](https://nips.cc/Conferences/2020/).
 Submissions will be accepted from November 1 to December 8, 2020.

python-sdk/nuscenes/eval/lidarseg/README.md

@@ -39,6 +39,13 @@ Any user that cannot attend the workshop (direct or via a representative) will b
 
 Click [here](https://eval.ai/web/challenges/challenge-page/720/overview) for the **EvalAI lidar segmentation evaluation server**.
 
+### 6th AI Driving Olympics, ICRA 2021
+The second nuScenes lidar segmentation challenge will be held at [ICRA 2021](http://www.icra2021.org/) as part of [The AI Driving Olympics: Evaluating Progress in Robotics through Standardized and Reproducible Benchmarks](https://driving-olympics.ai/).
+Submissions will be accepted from April 1 to May 26, 2021.
+The prizes will be awarded to submissions that outperform the previous state-of-the-art in their respective tracks.
+Results and winners will be announced at [The AI Driving Olympics: Evaluating Progress in Robotics through Standardized and Reproducible Benchmarks](https://driving-olympics.ai/).
+Note that this challenge uses the same [evaluation server](https://eval.ai/web/challenges/challenge-page/720/overview) as previous lidar segmentation challenges.
+
 ### 5th AI Driving Olympics, NeurIPS 2020
 The first nuScenes lidar segmentation challenge will be held at [NeurIPS 2020](https://nips.cc/Conferences/2020/).
 Submissions will be accepted from November 1 to December 8, 2020.

python-sdk/nuscenes/eval/prediction/README.md

@@ -36,6 +36,13 @@ Users that submit their results during the challenge period are eligible for awa
 
 Click [here](https://eval.ai/web/challenges/challenge-page/591/overview) for the **EvalAI prediction evaluation server**.
 
+### 6th AI Driving Olympics, ICRA 2021
+The second nuScenes prediction challenge will be held at [ICRA 2021](http://www.icra2021.org/) as part of [The AI Driving Olympics: Evaluating Progress in Robotics through Standardized and Reproducible Benchmarks](https://driving-olympics.ai/).
+Submissions will be accepted from April 1 to May 26, 2021.
+The prizes will be awarded to submissions that outperform the previous state-of-the-art in their respective tracks.
+Results and winners will be announced at [The AI Driving Olympics: Evaluating Progress in Robotics through Standardized and Reproducible Benchmarks](https://driving-olympics.ai/).
+Note that this challenge uses the same [evaluation server](https://eval.ai/web/challenges/challenge-page/591/overview) as previous prediction challenges.
+
 ### Workshop on Benchmarking Progress in Autonomous Driving, ICRA 2020
 The first nuScenes prediction challenge will be held at [ICRA 2020](https://www.icra2020.org/).
 This challenge will be focused on predicting trajectories for vehicles. The submission period will open April 1 and continue until May 28th, 2020.

python-sdk/nuscenes/eval/tracking/README.md

@@ -60,6 +60,13 @@ Any user that cannot attend the workshop (direct or via a representative) will b
 
 Click [here](https://eval.ai/web/challenges/challenge-page/476/overview) for the **EvalAI tracking evaluation server**.
 
+### 6th AI Driving Olympics, ICRA 2021
+The second nuScenes tracking challenge will be held at [ICRA 2021](http://www.icra2021.org/) as part of [The AI Driving Olympics: Evaluating Progress in Robotics through Standardized and Reproducible Benchmarks](https://driving-olympics.ai/).
+Submissions will be accepted from April 1 to May 26, 2021.
+The prizes will be awarded to submissions that outperform the previous state-of-the-art in their respective tracks.
+Results and winners will be announced at [The AI Driving Olympics: Evaluating Progress in Robotics through Standardized and Reproducible Benchmarks](https://driving-olympics.ai/).
+Note that this challenge uses the same [evaluation server](https://eval.ai/web/challenges/challenge-page/476/overview) as previous tracking challenges.
+
 ### AI Driving Olympics (AIDO), NIPS 2019
 The first nuScenes tracking challenge will be held at NIPS 2019.
 Submission will open October 1 and close December 9.