mcookie: add page (#3322)

pages/linux/mcookie.md

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+# mcookie
+
+> Generates random 128 bit hexadecimal numbers.
+
+- Generate a random number:
+
+`mcookie`
+
+- Generate a random number, using the contents of a file as a seed for the randomness:
+
+`mcookie --file {{path/to/file}}`
+
+- Generate a random number, using a specific number of bytes from a file as a seed for the randomness:
+
+`mcookie --file {{path/to/file}} --max-size {{number_of_bytes}}`
+
+- Print the details of the randomness used, such as the origin and seed for each source:
+
+`mcookie --verbose`