mitmdump: add page

pages/common/mitmdump.md

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+# mitmdump
+
+> View, record, and programmatically transform HTTP traffic.
+> The command-line counterpart to mitmproxy.
+
+- Start a proxy and save all output to a file:
+
+`mitmdump -w {{filename}}`
+
+- Filter a saved traffic file to just POST requests:
+
+`mitmdump -nr {{input_filename}} -w {{output_filename}} {{"~m post"}}`
+
+- Replay a saved traffic file:
+
+`mitmdump -nc {{filename}}`