yadm: add pages (#13920)

Co-authored-by: Sebastiaan Speck <12570668+sebastiaanspeck@users.noreply.github.com>
Co-authored-by: Wiktor Perskawiec <git@spageektti.cc>

pages/common/yadm-transcrypt.md

@@ -0,0 +1,26 @@
+# yadm-transcrypt
+
+> If `transcrypt` is installed, this command allows you to pass options directly to `transcrypt`.
+> With the environment configured to use the yadm repository.
+> Transcrypt enables transparent encryption and decryption of files in a Git repository.
+> More information: <https://github.com/elasticdog/transcrypt>.
+
+- Set the symmetric cipher to utilize for encryption:
+
+`yadm transcrypt --cipher={{cipher}}`
+
+- Pass the password to derive the key from:
+
+`yadm transcrypt --password={{password}}`
+
+- Assume yes and accept defaults for non-specified options:
+
+`yadm transcrypt --yes`
+
+- Display the current repository's cipher and password:
+
+`yadm transcrypt --display`
+
+- Re -encrypt all encrypted files using new credentials:
+
+`yadm transcrypt --rekey`