kaggle-competitions: add page

pages/common/kaggle-competitions.md

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+# kaggle competitions
+
+> Manage Kaggle competitions from the command-line.
+> More information: <https://github.com/Kaggle/kaggle-api/blob/main/docs/README.md#competitions>.
+
+- List all competitions:
+
+`kaggle {{[c|competitions]}} list`
+
+- Download competition data:
+
+`kaggle {{[c|competitions]}} download {{competition_name}}`
+
+- Download specific file:
+
+`kaggle {{[c|competitions]}} download {{competition_name}} {{[-f|--file]}} {{file}}`
+
+- Submit files to a competition:
+
+`kaggle {{[c|competitions]}} submit {{competition_name}} {{[-f|--file]}} {{path/to/file}} {{[-m|--message]}} "{{message}}"`
+
+- Show or download leaderboard:
+
+`kaggle {{[c|competitions]}} leaderboard {{competition_name}} {{--show|--download}}`
+
+- View submissions:
+
+`kaggle {{[c|competitions]}} submissions {{competition_name}}`