theory pages added

theory/binary.en.html

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+<h3>Base: 2</h3>
+<p>The binary (base-2) numeral system uses only two digits: 0 and 1. It is the fundamental language of digital computers, where each digit represents a single bit — an electrical signal that is either off (0) or on (1).</p>
+<h3>How it works</h3>
+<p>Each position represents a power of 2, increasing from right to left:</p>
+<div class="theory-example">1011 = 1×8 + 0×4 + 1×2 + 1×1 = 11</div>
+<h3>Digits</h3>
+<div class="theory-example">0  1</div>
+<h3>Uses</h3>
+<p>Binary is used internally by all modern computers. File storage, memory addresses, and network protocols all rely on binary representation at the lowest level.</p>