Created Configure Accounts (markdown)

Configure-Accounts.md

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+Users are managed in `config/postfix-accounts.cf`.
+Just add the full email address and its encrypted password separated by a pipe.
+
+Example:
+
+    user1@domain.tld|{CRAM-MD5}mypassword-cram-md5-encrypted
+    user2@otherdomain.tld|{CRAM-MD5}myotherpassword-cram-md5-encrypted
+
+To generate the password you could run for example the following:
+
+    docker run --rm \
+      -e MAIL_USER=user1@domain.tld \
+      -ti tvial/docker-mailserver:v2 \
+      /bin/sh -c 'echo "$MAIL_USER|$(doveadm pw -s CRAM-MD5 -u $MAIL_USER )"'
+
+You will be asked for a password. Just copy all the output string in the file `config/postfix-accounts.cf`.
+
+The `doveadm pw` command let you choose between several encryption schemes for the password.
+Use doveadm pw -l to get a list of the currently supported encryption schemes.