proxify: add page (#15549)

Co-authored-by: Juri Dispan <juri.dispan@posteo.net>
Co-authored-by: Wiktor Perskawiec <git@spageektti.cc>

pages/common/proxify.md

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+# proxify
+
+> A versatile and portable proxy for capturing, manipulating, and replaying HTTP/HTTPS traffic on the go.
+> See also: `mitmproxy`.
+> More information: <https://github.com/projectdiscovery/proxify>.
+
+- Start a HTTP proxy (on the loopback network interface `127.0.0.1` port `8888`):
+
+`proxify`
+
+- Start a HTTP proxy on a custom network interface and port (may require `sudo` for a port number lower than `1024`):
+
+`proxify -http-addr "{{network_interface}}:{{port_number}}"`
+
+- Specify output format and output file:
+
+`proxify -output-format {{jsonl|yaml}} -output {{path/to/file}}`
+
+- Display help:
+
+`proxify -h`