make all file names lowercase

vision/qr_codes.md

@@ -0,0 +1,28 @@
+---
+title: "QR Codes"
+tags: [ "qrencode", "zbar" ]
+---
+
+Make a QR Code image:
+
+```bash
+qrencode 'https://play.google.com/store/apps/details?id=org.briarproject.briar.android' -o "$FILE".png
+```
+
+Make a QR Coded message in the terminal:
+
+```bash
+qrencode -t ansi "Hello World"
+```
+
+Read a QR Code image:
+
+```bash
+zbarimg $FILE
+```
+
+Show wifi QR code (only with Network Manager):
+
+```bash
+nmcli device wifi show-password
+```