theory pages added

theory/braille.en.html

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+<h3>Braille Decimal</h3>
+<p>Braille is a tactile writing system used by people who are visually impaired. Each digit is represented by a specific pattern of raised dots within a 2×3 cell. In this app, the Braille decimal system encodes digits 0–9.</p>
+<h3>Pattern</h3>
+<p>Each digit is preceded by the number indicator (⠼), which signals that the following characters represent numbers rather than letters.</p>
+<h3>Digits (0–9)</h3>
+<div class="theory-example">⠼⠚  ⠼⠁  ⠼⠃  ⠼⠉  ⠼⠙  ⠼⠑  ⠼⠋  ⠼⠛  ⠼⠓  ⠼⠊</div>
+<p>These correspond to: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9</p>
+<h3>Uses</h3>
+<p>Braille numerals are used in Braille books, signage, and electronic Braille displays. The number sign distinguishes numeric content from alphabetic text.</p>