[Update]update competition description (#876)

Author: lijialin03

competition/README.md

@@ -3,6 +3,8 @@
 This part is for all competitions.
 Codes of all competitions are stored by submoudule. If you need to obtain it, please initialize the submoudule after cloning PaddleScience.
 
+When you initialize the submoudule, some competitions need your username and password(or token). You can register on the corresponding official website and then get it, usually in "Settings" - "Create Personal Token".
+
 ## submodule initialization
 
 ``` sh
@@ -13,6 +15,6 @@ git submodule update --init --recursive competition/IJCAI_2024_CAR
 
 ## competition list
 
-| competition name | submodule name | official website |
-|-------------|-------------|-------------|
-| IJCAI | IJCAI_2024_CAR | [IJCAI_2024_CAR](https://competition.atomgit.com/competitionInfo?id=7f3f276465e9e845fd3a811d2d6925b5) |
+| competition name | submodule name | competition website | official website |
+|-------------|-------------|-------------|-------------|
+| IJCAI | IJCAI_2024_CAR | [IJCAI_2024_CAR](https://competition.atomgit.com/competitionInfo?id=7f3f276465e9e845fd3a811d2d6925b5) | [atomgit](https://atomgit.com/) |