Add md docs

Author: AlanoSong

Docs/Topics/1_MonitorFileChangesUnderWindowsSystem.md

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+# Monitor File Changes Under Windows System
+
+## Method 1
+
+### Details
+- Windows system API: `ReadDirectoryChangesW()`
+- Like `DWORD WINAPI MonitorThread(LPVOID lp)` in `TaskThreads.cpp`
+- Firstly we create a handle for each volume in system, like `C:\`
+- Then we monitor `C:\` with the handle by `ReadDirectoryChangesW()`
+- We can set many flags when we monitor the volume, like `FILE_NOTIFY_CHANGE_FILE_NAME`, `FILE_NOTIFY_CHANGE_DIR_NAME`, `FILE_NOTIFY_CHANGE_SIZE`, and we only concern file add, delete, modify
+```cpp
+// hVolume is the volume handle
+// notifyInfo is a FILE_NOTIFY_INFORMATION structure, system will populate data in it
+ReadDirectoryChangesW(
+            hVolume,
+            &notifyInfo,
+            sizeof(notifyInfo),
+            true, // Monitor sub directory
+            FILE_NOTIFY_CHANGE_FILE_NAME | FILE_NOTIFY_CHANGE_DIR_NAME | FILE_NOTIFY_CHANGE_SIZE,
+            &retBytes,
+            nullptr,
+            nullptr)
+```
+- We call `ReadDirectoryChangesW()` in a sub thread, in this thread we use this function in a dead loop until receive exit event
+- After we receive the file changes event, we won't handle it immediately in monitor thread
+- Cause there are too many event in system, we may lost other events if we cost time to handle current event.
+- So we just push this event into a global task queue `g_updateDataBaseTaskList`, and handle those events one by one in another thread `UpdateSqlDataBaseThread`
+
+### Advantages
+- It's very simple to carry on, cause Windows system offers everything
+
+### Disadvantages
+- Sometimes we cannot receive file change events under a specail volume, such as `C:`, Windows system won't send the event ? or there are bugs in this software ? don't know
+
+## Method 2
+
+- So how does `Everything` monitor files change events ? need some time to analyse
+- To be continue ...

Docs/Topics/2_Sqlite3SpeedupMethod.md

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+    <None Include="Docs\Topics\3_SpeedupQtTableViewAddContent.md" />
     <None Include="LICENSE" />
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Docs/Topics/3_SpeedupQtTableViewAddContent.md

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