docs: Add vedio tutorial

Author: Timothy-Liuxf

docs/languages/CSharp_1_basic.mdx

@@ -1696,3 +1696,23 @@ C# 保留了指针类型，但是我们只能定义非托管类型的指针，
 1. https://docs.microsoft.com/en-us/  
 2. 《复变函数与数理方程》教案，吴昊（男）  
 
+---
+
+## 视频教程
+
+<div style={{ position: "relative", padding: "30% 45%" }}>
+  <iframe
+    style={{
+      position: "absolute",
+      width: "100%",
+      height: "100%",
+      left: 0,
+      top: 0,
+    }}
+    src="https://player.bilibili.com/player.html?aid=765901878&bvid=BV1vr4y1e7pe&cid=491007595&page=4&as_wide=1&high_quality=1&danmaku=0"
+    frameborder="no"
+    scrolling="no"
+    allowfullscreen="true"
+  ></iframe>
+</div>
+

docs/languages/CSharp_2_multithread.mdx

@@ -1298,3 +1298,22 @@ ThreadPool.ThreadCount; // 获取线程池中的线程数目
 7. https://leetcode-cn.com/problemset/all/，2021 年 7 月 15 日  
 8. https://docs.eesast.com/docs/languages/CSharp_2_multithread，2021 年 7 月 15 日  
 
+---
+
+## 视频教程
+
+<div style={{ position: "relative", padding: "30% 45%" }}>
+  <iframe
+    style={{
+      position: "absolute",
+      width: "100%",
+      height: "100%",
+      left: 0,
+      top: 0,
+    }}
+    src="https://player.bilibili.com/player.html?aid=765901878&bvid=BV1vr4y1e7pe&cid=491024762&page=5&as_wide=1&high_quality=1&danmaku=0"
+    frameborder="no"
+    scrolling="no"
+    allowfullscreen="true"
+  ></iframe>
+</div>

docs/languages/WPF.mdx

@@ -286,3 +286,23 @@ title: WPF
 ## References
 
 https://www.cnblogs.com/zh7791/category/1528742.html （来自博客园大佬的教程，建议深度学习orz）
+
+---
+
+## 视频教程
+
+<div style={{ position: "relative", padding: "30% 45%" }}>
+  <iframe
+    style={{
+      position: "absolute",
+      width: "100%",
+      height: "100%",
+      left: 0,
+      top: 0,
+    }}
+    src="https://player.bilibili.com/player.html?aid=765901878&bvid=BV1vr4y1e7pe&cid=491030440&page=7&as_wide=1&high_quality=1&danmaku=0"
+    frameborder="no"
+    scrolling="no"
+    allowfullscreen="true"
+  ></iframe>
+</div>

docs/languages/Winform.mdx

@@ -79,3 +79,23 @@ title: Winform
 - 绘图图层在当前控件的最底层！
 
 ## Winform应用场景太少啦，大家玩玩就好，无作业
+
+---
+
+## 视频教程
+
+<div style={{ position: "relative", padding: "30% 45%" }}>
+  <iframe
+    style={{
+      position: "absolute",
+      width: "100%",
+      height: "100%",
+      left: 0,
+      top: 0,
+    }}
+    src="https://player.bilibili.com/player.html?aid=765901878&bvid=BV1vr4y1e7pe&cid=490985394&page=6&as_wide=1&high_quality=1&danmaku=0"
+    frameborder="no"
+    scrolling="no"
+    allowfullscreen="true"
+  ></iframe>
+</div>

docs/tools/docker.mdx

@@ -1298,3 +1298,43 @@ Sending build context to Docker daemon 2.048 kB
 - `Dockerfile` 最佳实践文档：https://docs.docker.com/develop/develop-images/dockerfile_best-practices/
 
 - `Docker` 官方镜像 `Dockerfile`：https://github.com/docker-library/docs
+
+---
+
+## 视频教程
+
+### 2020
+
+<div style={{ position: "relative", padding: "30% 45%" }}>
+  <iframe
+    style={{
+      position: "absolute",
+      width: "100%",
+      height: "100%",
+      left: 0,
+      top: 0,
+    }}
+    src="https://player.bilibili.com/player.html?aid=243753051&bvid=BV1fv411B73p&cid=212071258&page=3&as_wide=1&high_quality=1&danmaku=0"
+    frameborder="no"
+    scrolling="no"
+    allowfullscreen="true"
+  ></iframe>
+</div>
+
+### 2021
+
+<div style={{ position: "relative", padding: "30% 45%" }}>
+  <iframe
+    style={{
+      position: "absolute",
+      width: "100%",
+      height: "100%",
+      left: 0,
+      top: 0,
+    }}
+    src="https://player.bilibili.com/player.html?aid=765901878&bvid=BV1vr4y1e7pe&cid=490991884&page=8&as_wide=1&high_quality=1&danmaku=0"
+    frameborder="no"
+    scrolling="no"
+    allowfullscreen="true"
+  ></iframe>
+</div>