hledger: add page (#8635)

pages/common/hledger.md

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+# hledger
+
+> A plain text accounting software for the command-line.
+> More information: <https://hledger.org>.
+
+- Add transactions to your journal interactively:
+
+`hledger add`
+
+- Show the account hierarchy, using a specific journal file:
+
+`hledger --file {{path/to/file.journal}} accounts --tree`
+
+- Show a monthly income statement:
+
+`hledger incomestatement --monthly --depth 2`
+
+- Print the amount of cash spent on food:
+
+`hledger print assets:cash | hledger -f- -I balance expenses:food --depth 2`