Crypto/bagua: 添加选手 Writeup 仓库链接 - #1
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Added a link to the bagua entry in the README.
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在 Crypto 题目列表的 bagua 行补充 Writeup 仓库链接：
https://github.com/lyuhui115/bagua-crypto
仓库内含题目分析、解题脚本（Python）与 Writeup。
Flag：
flag{B1n4ry_B4gua_L3ibn1z_1687}解题思路：将每个卦象视为 3 位二进制（阳爻=1，阴爻=0，上→中→下读），每组 3 卦 = 9 bit，高 8 位即 ASCII 字符。