Add README_unix.md

Signed-off-by: Yuhang Zhao <2546789017@qq.com>

README.md

@@ -1,4 +1,4 @@
-# FramelessHelper
+# FramelessHelper (Win32 version)
 
 ## Screenshots
 
@@ -55,7 +55,7 @@ data.maximumSize = QSize(1280, 720);
 data.minimumSize = QSize(800, 540);
 // How to set ignore areas:
 // The geometry of something you already know, in window coordinates
-data.ignoreAreas.append(QRect(100, 0, 30, 30));
+data.ignoreAreas.append({100, 0, 30, 30});
 // The geometry of a widget, in window coordinates.
 // It won't update automatically when the geometry of that widget has
 // changed, so if you want to add a widget, which is in a layout and
@@ -83,8 +83,10 @@ The code itself should be able to work on Windows Vista in theory, but Qt has dr
 
 ## Requirements
 
-- Qt: at least 5.6 (no modules are required, but to make full use of this repository, you'd better install the `gui`, `widgets` and `quick` modules)
+| Component | Requirement | Additional Information |
-- Compiler: support C++11 at least. MSVC, MinGW, Clang-CL, Intel-CL or cross compile from Linux are all supported.
+| --- | --- | --- |
+| Qt | >= 5.6 | No modules are required explicitly, but to make full use of this repository, you'd better install the `gui`, `widgets` and `quick` modules |
+| Compiler | >= C++11 | MSVC, MinGW, Clang-CL, Intel-CL or cross compile from Linux are all supported |
 
 ## Notes for developers
 

README_unix.md

@@ -0,0 +1,62 @@
+# FramelessHelper (UNIX version)
+
+## Screenshots
+
+TODO
+
+## Features
+
+- Frameless (of course!).
+- Draggable.
+- Resizable.
+- Cross-platform: Windows, X11, Wayland, macOS (however, it doesn't look good on Windows, so you may want to try [`WinNativeEventFilter`](/winnativeeventfilter.h) instead).
+
+As for the frame shadow and other window features, they mainly depend on your window manager.
+
+## Usage
+
+```cpp
+QWidget widget;
+FramelessHelper helper;
+helper.removeWindowFrame(&widget);
+widget.show();
+```
+
+### Ignore areas and etc
+
+```cpp
+helper.setIgnoreAreas(&widget, {{0, 0, 30, 40}, {40, 0, 30, 40}});
+```
+
+## Requirements
+
+| Component | Requirement | Additional Information |
+| --- | --- | --- |
+| Qt | >= 5.15 | This code uses two functions, [`startSystemMove`](https://doc.qt.io/qt-5/qwindow.html#startSystemMove) and [`startSystemResize`](https://doc.qt.io/qt-5/qwindow.html#startSystemResize), which are introduced in Qt 5.15 |
+| Compiler | >= C++11 | MSVC, MinGW, Clang-CL, Intel-CL / GCC, Clang, ICC are all supported |
+
+## License
+
+```text
+MIT License
+
+Copyright (C) 2020 by wangwenx190 (Yuhang Zhao)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+```