add example configs

config-examples/getmail/getmailrc_general.cf

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+# https://getmail6.org/configuration.html#conf-options
+
+[options]
+verbose = 0
+read_all = false
+delete = false
+max_messages_per_session = 500
+received = false
+delivered_to = false
+message_log_syslog = true
+

config-examples/getmail/imap-example.cf

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+# https://getmail6.org/configuration.html
+
+[retriever]
+type = SimpleIMAPSSLRetriever
+server = imap.gmail.com
+username = alice
+password = notsecure
+
+[destination]
+type = MDA_external
+path = /usr/lib/dovecot/deliver
+allow_root_commands = true
+arguments =("-d","user1@example.com")

config-examples/getmail/pop3-example.cf

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+# https://getmail6.org/configuration.html
+
+[retriever]
+type = SimplePOP3SSLRetriever
+server = pop3.gmail.com
+username = alice
+password = notsecure
+
+[destination]
+type = MDA_external
+path = /usr/lib/dovecot/deliver
+allow_root_commands = true
+arguments =("-d","user1@example.com")