Add helpers for accessing the appstore

Signed-off-by: Christian Wolf <github@christianwolf.email>

.helpers/appstore/.gitignore

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+token.file

.helpers/appstore/URL

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+https://nextcloudappstore.readthedocs.io/en/latest/restapi.html#specification

.helpers/appstore/query-request.sh

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+#!/bin/bash
+
+dir=$(dirname "$0")
+TOKEN=$(cat "$dir/token.file")
+
+curl -H "Authorization: Token $TOKEN" "$@"