Add BraveScriptlets/README.md

BraveScriptlets/README.md

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+1. Brave Settings
+2. Shields
+3. Content Filtering
+4. Enable Developer Mode
+5. Scroll all the way down Add New Scriptlet
+
+When done adding scriptlet add it to the create custom filters box above like:
+
+```
+x.com##+js(fuck-twitter-promote-buttons.js)
+```