feat: add SDM263 feedback control theory

courses/SDM263.md

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+# Feedback Control Theory
+
+## Introduction
+Classical control theory, mainly concerned with transfer function, time-domain analysis, stability, root locus, PID, frequency-domain analysis, and controller design.
+
+This course is the basis for the more advanced courses in control theory.
+
+## Notes
+
+[Lecture Notes](https://squarezhong.notion.site/Feedback-Control-Theorem-d7f921b3c64e41ee82db147f806db5d9?pvs=4) @squarezhong
+
+## Lab
+
+Use NCSLab to do some very simple control experiments.
+
+## Tools
+- NCSLab
+- [root-locus](https://github.com/squarezhong/root-locus)
+
+## Books
+- 自动控制原理 (胡寿松)
+- Modern Control Systems, 13th (Richard C. Dorf, Robert H. Bishop)
+- Automatic Control Systems, 10th (Farid Golnaraghi , Benjamin C.Kuo)
+
+## Links