Add empty .yarnclean

Author: christopherthielen

.yarnclean

@@ -0,0 +1,42 @@
+# test directories
+#__tests__
+#test
+#tests
+#powered-test
+
+# asset directories
+#docs
+#doc
+##website
+#images
+#assets
+
+# examples
+#example
+#examples
+
+# code coverage directories
+#coverage
+#.nyc_output
+
+# build scripts
+#Makefile
+#Gulpfile.js
+#Gruntfile.js
+
+# configs
+#.tern-project
+#.gitattributes
+#.editorconfig
+#.*ignore
+#.eslintrc
+#.jshintrc
+#.flowconfig
+#.documentup.json
+#.yarn-metadata.json
+#.*.yml
+#*.yml
+
+# misc
+#*.gz
+#*.md