Merge branch 'patch-4' into 'master'

更新 README.md See merge request !6

Merge branch 'patch-4' into 'master'
e0136be4 · 李川 · cb26b9cd · a5a85837 · e0136be4
--- a/README.md
+++ b/README.md
 # 说明
 Intel 8255 可编程并行接口芯片
+# Datasheet
+[8255.pdf](8255.pdf)
 # 原理图
 ![raw svg](8255.dlsche.svg)
\ No newline at end of file