create todo list in README.md

README.md

 # react-natvie-ossd-radio-button
 Customizable React Native Radio Button
+
+### React Native OSSD Radio Button Checklist
+
+- [x] Create new repository and first commit
+- [x] Learn about npm and how to publish to it
+- [x] Create npm account
+- [x] Create src and RadioButton Component
+- [ ] Create first simple radio button without custom settings
+- [ ] Radio button can show/hide radio
+- [ ] Radio Button can customize color
+- [ ] Radio Button can add image
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