qr: add page (#3769)

* qr: add page * Update qr.md
2020-01-20 20:58:38 +00:00 · 2020-01-20 20:58:38 +00:00 · 7916181b6e
parent abe0abda67
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--- a/pages/common/qr.md
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+# qr
+
+> Generate QR codes in the terminal with ANSI VT-100 escape codes.
+> More information: <https://github.com/lincolnloop/python-qrcode/>.
+
+- Generate a QR code:
+
+`echo "{{data}}" | qr`
+
+- Specify the error correction level (defaults to M):
+
+`echo "{{data}}" | qr --error-correction={{L|M|Q|H}}`