add credo config

Author: mjheilmann

.credo.exs

@@ -0,0 +1,16 @@
+%{
+  configs: [
+    %{
+      name: "default",
+      files: %{
+        included: ["lib", "test"],
+        excluded: ["lib/proto", "test/support/*"]
+      },
+      plugins: [],
+      requires: [],
+      strict: false,
+      parse_timeout: 5000,
+      color: true
+    }
+  ]
+}

.formatter.exs

@@ -1,4 +1,4 @@
 # Used by "mix format"
 [
-  inputs: ["{mix,.formatter}.exs", "{config,lib,test,examples}/**/*.{ex,exs}"]
+  inputs: ["{mix,.formatter,.credo}.exs", "{config,lib,test,examples}/**/*.{ex,exs}"]
 ]