refactor: Rename High-School to Middle-High-School, add folder README

Middle-High-School/README.md

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+# Middle & High School Weekly Vocabulary
+
+This folder contains weekly vocabulary word lists designed for middle and high school students (Grades 6-12).
+
+Each week's folder includes:
+- **README.md** - The vocabulary word list with definitions, parts of speech, and example sentences
+
+## Word Level
+The words in this folder range from middle school to advanced adult level, focusing on:
+- Academic writing and reading comprehension
+- Literary analysis and interpretation
+- Standardized test preparation (SAT/ACT)
+- College and career readiness
+
+## How to Use
+1. Review the definition and part of speech
+2. Read the example sentence
+3. Discuss how the word might be used in different contexts
+4. Have the student create their own sentence using the word