Duplicate pwgen command to osx (#1609)

pages/osx/pwgen.md

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+# pwgen
+
+> Generate pronounceable passwords.
+
+- Generate random password with s[y]mbols:
+
+`pwgen -y {{length}}`
+
+- Generate secure, hard-to-memorize passwords:
+
+`pwgen -s {{length}}`
+
+- Generate password with at least one capital letter in them:
+
+`pwgen -c {{length}}`