keybase: add page

pages/common/keybase.md

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+# keybase
+
+> Key directory that maps social media identities to encryption keys in a publicly auditable manner.
+
+- Follow another user:
+
+`keybase follow {{username}}`
+
+- Add a new proof:
+
+`keybase prove {{service}} {{service_username}}`
+
+- Sign a file:
+
+`keybase sign --infile {{input_file}} --outfile {{output_file}}`
+
+- Verify a signed file:
+
+`keybase verify --infile {{input_file}} --outfile {{output_file}}`
+
+- Encrypt a file:
+
+`keybase encrypt --infile {{input_file}} --outfile {{output_file}} {{receiver}}`
+
+- Decrypt a file:
+
+`keybase decrypt --infile {{input_file}} --outfile {{output_file}}`
+
+- Revoke current device, log out, and delete local data:
+
+`keybase deprovision`