dodanie nowych komponentow oraz dodanie walidacji propTypes

src/components/SelectedSkill.jsx

@@ -1,4 +1,4 @@
-import React from 'react';
+import propTypes from 'prop-types';
 
 const levelMappings = {
     'N': 'Nice to have',
@@ -53,4 +53,12 @@ const SelectedSkill = ({ skill_name, skillId ,letter, onLevelChange, removeSkill
   );
 };
 
+SelectedSkill.propTypes = {
+    skill_name: propTypes.string,
+    skillId: propTypes.number,
+    letter: propTypes.string,
+    onLevelChange: propTypes.func,
+    removeSkillFromList: propTypes.func,
+    };
+
 export default SelectedSkill;