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 competitions list`
+
+- Download Competition Data:
+
+`kaggle competitions download -c {{competition_name}}`
+
+- Download specific file:
+
+`kaggle competitions download -c {{competition_name}} -f {{file}}`
+
+- Submit files to a competition:
+
+`kaggle competitions submit -c {{competition-name}} -f {{file-path}} -m "{{message}}"`
+
+- Show or Download leaderboard:
+
+`kaggle competitions leaderboard {{competition-name}} {{--show|--download}}`
+
+- View Submissions:
+
+`kaggle competitions submissions -c {{competition_name}}`