in-toto-record: add page

pages/common/in-toto-record.md

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+# in-toto-record
+
+> Create a signed link metadata file to provide evidence for supply chain steps.
+> More information: <https://in-toto.readthedocs.io/en/latest/command-line-tools/in-toto-record.html>.
+
+- Start the record (creates a preliminary link file):
+
+`in-toto-record start -n {{edit-files}} -k {{path/to/key_file}} -m {{.}}`
+
+- Stop the record (expects a preliminary link file):
+
+`in-toto-record stop -n {{edit-files}} -k {{path/to/key_file}} -p {{.}}`