add eslint config file
diff --git a/.eslintrc.yml b/.eslintrc.yml
new file mode 100644
index 0000000..f6aae32
--- /dev/null
+++ b/.eslintrc.yml
@@ -0,0 +1,10 @@
+root: true
+extends: semistandard
+rules:
+  indent:
+    - error
+    - 4
+  camelcase: off
+  padded-blocks: off
+  operator-linebreak: off
+  no-throw-literal: off