Add Apache Rat configuration
Apache Rat (Release Audit Tool) is (or was at least) a preferred code license
checking tool used by the ASF. The `.ratignore` file contains a list of files to
exclude from scans. The code used to run Apache Rat was:
java -jar ~/bin/apache-rat-0.13/apache-rat-0.13.jar -E .ratignore -d . > rat_report.txt
Apache Rat: https://creadur.apache.org/rat/
diff --git a/.ratignore b/.ratignore
new file mode 100644
index 0000000..a97cd9e
--- /dev/null
+++ b/.ratignore
@@ -0,0 +1,18 @@
+.editorconfig
+.eslintignore
+.eslintrc.js
+.gitignore
+.lintstagedrc
+.npmignore
+.nycrc
+.ratignore
+.travis.yml
+lerna.json
+node_modules
+package.json
+rat_report.txt
+repolinter.json
+yarn.lock
+CODE_OF_CONDUCT.md
+README.md
+SECURITY.md
