Add Elvis default configuration

elvis.config

@@ -0,0 +1,42 @@
+[
+ {
+  elvis,
+  [
+   {config,
+    [#{dirs => ["src"],
+       filter => "*.erl",
+       ruleset => erl_files,
+       rules => [{elvis_style, line_length, #{limit => 100,
+                                              skip_comments => false}},
+                 {elvis_text_style, no_tabs, disable},
+                 {elvis_style, no_debug_call, disable},
+                 {elvis_style, operator_spaces, disable},
+                 {elvis_style, invalid_dynamic_call, disable},
+                 {elvis_style, variable_naming_convention, #{ regex => ".*" }},
+		 {elvis_style, dont_repeat_yourself, #{min_complexity => 20}}
+		]
+      },
+     #{dirs => ["."],
+       filter => "Makefile.in",
+       ruleset => makefiles,
+       rules => [{elvis_style, line_length, #{limit => 100,
+                                              skip_comments => false}},
+                 {elvis_style, no_tabs, disable},
+		 {elvis_style, dont_repeat_yourself, #{min_complexity => 20}}
+		]
+      },
+     #{dirs => ["."],
+       filter => "rebar.config",
+       ruleset => rebar_config,
+       rules => [{elvis_style, line_length, #{limit => 100,
+                                              skip_comments => false}},
+                 {elvis_style, no_tabs, disable},
+		 {elvis_style, dont_repeat_yourself, #{min_complexity => 20}}
+		]
+      }
+     }
+    ]
+   }
+  ]
+ }
+].