README: Add disclaimer and "Known Caveats" section

Author: Turbo87

README.md

@@ -3,6 +3,9 @@ tagless-ember-components-codemod
 
 Converts regular Ember.js components to `tagName: ''` components
 
+**This codemod is experimental and might break your app. Make sure to
+review the changes that it creates!**
+
 
 Usage
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@@ -47,6 +50,15 @@ export default Component.extend({
 ```
 
 
+Known Caveats
+------------------------------------------------------------------------------
+
+- Due to the way `jscodeshift` works it sometimes removes empty lines between
+  component properties, or adds new ones unexpectedly
+
+- [Open Issues](https://github.com/ember-codemods/tagless-ember-components-codemod/issues)
+
+
 License
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