gnucash, gnucash-cli: add page (#5936)

pages/common/gnucash-cli.md

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+# gnucash-cli
+
+> A command-line version of GnuCash.
+> More information: <https://gnucash.org>.
+
+- Get quotes for currencies and stocks specified in a file and print them:
+
+`gnucash-cli --quotes get {{path/to/file.gnucash}}`
+
+- Generate a financial report of a specific type, specified by `--name`:
+
+`gnucash-cli --report run --name "{{Balance Sheet}}" {{path/to/file.gnucash}}`

pages/common/gnucash.md

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+# gnucash
+
+> Personal and small-business financial-accounting software.
+> More information: <https://gnucash.org>.
+
+- Launch GnuCash and load the previously opened file:
+
+`gnucash`
+
+- Launch GnuCash and load the specified file:
+
+`gnucash {{path/to/file.gnucash}}`
+
+- Launch GnuCash and load an empty file:
+
+`gnucash --nofile`