mkswap: add page

pages/linux/mkswap.md

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+# mkswap
+
+> Sets up a Linux swap area on a device or in a file.
+
+- Setup a given partition as swap area:
+
+`sudo mkswap {{/dev/sdb7}}`
+
+- Use a given file as swap area:
+
+`sudo mkswap {{path/to/file}}`
+
+- Check a partition for bad blocks before creating the swap area:
+
+`sudo mkswap -c {{/dev/sdb7}}`
+
+- Specify a label for the file (to allow `swapon` to use the label):
+
+`sudo mkswap -L {{swap1}} {{path/to/file}}`