Initial .gitignore and rebar.config

.gitignore

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+_build
+*.beam

rebar.config

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+{erl_opts, [debug_info, {parse_transform, lager_transform}]}.
+
+{deps, [
+	{setup, "2.0.2"},
+	{lager, "3.6.8"},
+	{osmo_ss7, {git, "git://git.osmocom.org/erlang/osmo_ss7", {branch, "laforge/wip"}}},
+	{osmo_gsup,  {git, "git://git.osmocom.org/erlang/osmo_gsup", {branch, "master"}}}
+]}.
+
+{minimum_otp_vsn, "20.3"}.
+
+{xref_checks, [undefined_function_calls, undefined_functions,
+	       deprecated_function_calls, deprecated_functions]}.
+
+{provider_hooks,
+        [{pre,
+                [{compile, {diameter, compile}},
+                 {clean, {diameter, clean}}
+        ]}
+]}.
+
+{dialyzer, [
+	{plt_extra_apps, [kernel, stdlib, erts, tools, inets, compiler]},
+	{warnings, [no_improper_lists]}
+	]}.