Docs adjusted, utils.md added

docs/utils.md

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+# Utility Subcommands
+
+Besides the Live-Trade and Dry-Run run modes, the `backtesting`, `edge` and `hyperopt` optimization subcommands, and the `download-data` subcommand which prepares historical data, the bot contains a number of utility subcommands. They are described in this section.
+
+## List Exchanges
+
+```
+usage: freqtrade list-exchanges [-h] [-1]
+
+optional arguments:
+  -h, --help        show this help message and exit
+  -1, --one-column  Print exchanges in one column.
+```
+
+## List Timeframes
+
+```
+usage: freqtrade list-timeframes [-h] [--exchange EXCHANGE] [-1]
+
+optional arguments:
+  -h, --help           show this help message and exit
+  --exchange EXCHANGE  Exchange name (default: `bittrex`). Only valid if no
+                       config is provided.
+  -1, --one-column     Print exchanges in one column.
+
+```