feat: add docs

Author: hunjixin

docs/refrences.md

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+一些参考的资料和引用
+
+1. lakefs实现 https://github.com/treeverse/lakeFS
+2. git内部原理 https://git-scm.com/book/zh/v2/Git-%E5%86%85%E9%83%A8%E5%8E%9F%E7%90%86-%E5%BA%95%E5%B1%82%E5%91%BD%E4%BB%A4%E4%B8%8E%E4%B8%8A%E5%B1%82%E5%91%BD%E4%BB%A4
+3. go-git代码实现 https://github.com/go-git/go-git
+4. gitlab实现 https://github.com/gitlabhq/gitlabhq
+5. https://github.com/dolthub
+
+
+
+git设计
+
+1. objects 
+    数据对象 100644普通文件/100755可执行文件/120000符号链接
+    树对象
+    提交对象
+
+2. refs
+    HEAD     .git/HEAD
+    引用      .git/refs/heads
+    标签引用   .git/refs/tags
+    远程引用   .git/refs/remotes
+
+3. 包文件 压缩上述文件到包里面
+ 
+4. 传输协议 smart http/ssh