rspamc: add page (#1612)

pages/linux/rspamc.md

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+# rspamc
+
+> Command line client for rspamd servers.
+
+- Train the bayesian filter to recognise an email as spam:
+
+`rspamc learn_spam {{path/to/email_file}}`
+
+- Train the bayesian filter to recognise an email as ham:
+
+`rspamc learn_ham {{path/to/email_file}}`
+
+- Generate a manual report on an email:
+
+`rspamc symbols {{path/to/email_file}}`
+
+- Show server statistics:
+
+`rspamc stat`