erl: add page (#2364)

pages/common/erl.md

@@ -0,0 +1,15 @@
+# erl
+
+> Run and manage programs in the Erlang programming language.
+
+- Compile and run sequential Erlang program as a common script and then exit:
+
+`erlc {{files}} && erl -noshell '{{mymodule:myfunction(arguments)}}, init:stop().'`
+
+- Connect to a running Erlang node:
+
+`erl -remsh {{nodename}}@{{hostname}} -sname {{custom_shortname}} -hidden -setcookie {{cookie_of_remote_node}}`
+
+- Tell the Erlang shell to load modules from a directory:
+
+`erl -pa {{directory_with_beam_files}}`