添加protobuf的wiki

Author: CodingdAwn

Diff for: Personal.md

@@ -40,3 +40,5 @@
 [c++问题](./personal/cpp)
 [折腾linux](./personal/linux)
 [数据库](./personal/DB)
+[csharp](./personal/csharp)
+[一些工具](./personal/tool)

Diff for: personal/csharp.md

@@ -1 +1,4 @@
 # c# 相关
+
+- [SynchronizationContext](./csharp/SynchronizationContext.md)
+- [exploring the async/await state machine](./csharp/exploring_async.md)

Diff for: personal/csharp/协程.md renamed to personal/csharp/SynchronizationContext.md

@@ -0,0 +1,44 @@
+# Exploring the async/await State Machine
+learn about c# await pattern
+
+## The Awaitable Pattern
+* When we await some operation, it first gets a chance to complete synchronously. 
+* introduce IsComplete GetResult OnComplete
+* 主要的是await不是async，如果async的函数中没有await的关键字，那么这个函数的执行就是同步的
+* 异步其实就是回调
+
+[ref](https://vkontech.com/exploring-the-async-await-state-machine-the-awaitable-pattern/)
+---------------------------------
+
+## Main Workflow and State Transitions
+* 介绍了状态机的运行的流程
+* 可以看出状态机根据await划分了step，然后不停的movenext检查每一步的状态机状态，每一步awaiter是否IsComplete
+  如果完成，则调用GetResult获取结果，没有完成调用ContinueWith
+
+[ref](https://vkontech.com/exploring-the-async-await-state-machine-main-workflow-and-state-transitions/)
+[ref -> closures](https://vkontech.com/the-intuitive-guide-to-understanding-closures-in-c/)
+---------------------------------
+
+## Conceptual Implementation
+* 通过实现的简单版状态机可以看出如果awaiter调用IsComplete没有完成，那么会调用OnComplete(MoveNext)也就是当任务完成时，会调用MoveNext即回调处理
+* 相同类型的result只会创建一个awaiter，re-use
+
+[ref](https://vkontech.com/exploring-the-async-await-state-machine-conceptual-implementation/)
+
+---------------------------------
+
+## Concrete Implementation
+* live on the stack -> This means no work for the Garbage Collector and optimal memory footprint
+* However, the main idea of async programming is to pause, offload the current thread, and continue later (probably on some other thread).
+* boxing State Machine onto heap - > 因为要在之后继续调用呢，栈肯定没了，必须boxing到heap
+  IAsyncStateMachine boxed = stateMachine; stateMachine本身是一个struct，但是这样复制就导致了boxing，boxed就在堆了，因为boxed是一个引用类型
+
+[ref](https://vkontech.com/exploring-the-async-await-state-machine-concrete-implementation/)
+---------------------------------
+
+## Synchronization Context
+* The default Synchronization Context implementation would just schedule your callback to the Thread Pool
+* 
+
+[ref](https://vkontech.com/exploring-the-async-await-state-machine-synchronization-context/)
+---------------------------------

Diff for: personal/csharp/exploring_async.md

@@ -0,0 +1,4 @@
+# tool
+
+
+- [protobuf](./tool/protobuf.md)

Diff for: personal/tool.md

@@ -0,0 +1,7 @@
+# protobuf 
+
+## protogen
+在生成cs文件的时候，package的名字大小写有问题
+比如package ET，导出之后是namespage Et
+加上+names=original即可
+protogen --csharp_out=. test.proto +names=original

Diff for: personal/tool/protobuf.md

@@ -31,3 +31,7 @@ figlet 一个文本转化的工具
 - 一个windows的桌面美化工具 [rainmeter](./tools/introduce/rainmeter.md) 
 - tilling windows manager for windows [komorebi](./tools/introduce/komorebi.md)
 - 使用hyper V with majaro hyper V 
+
+## Tips
+tldr something
+curl cht.sh/python/random+string