Update build section in readme and env script (ElvinC#128)

README.md

@@ -182,13 +182,14 @@ The project also supports UI live reload, it's a super quick way of working with
 2. Clone the repo: `git clone https://github.com/gyroflow/gyroflow.git`
 3. Install dependencies to the `ext` directory: `cd gyroflow/ext`
     - `Qt 6.2.3` or higher: `pip3 install -U pip & pip3 install aqtinstall` then `aqt install-qt windows desktop 6.2.3 win64_msvc2019_64` or use the [official installer](https://www.qt.io/download-qt-installer)
-    - `FFmpeg 4.4`: https://sourceforge.net/projects/avbuild/files/windows-desktop/ffmpeg-4.4-windows-desktop-clang-gpl-lite.tar.xz/download
+    - `FFmpeg 4.4`: download [ffmpeg 4.4 lite](https://sourceforge.net/projects/avbuild/files/windows-desktop/ffmpeg-4.4-windows-desktop-clang-gpl-lite.tar.xz/download) and unzip it to `ext/ffmpeg-4.4-windows-desktop-clang-gpl-lite`
     - vcpkg: `git clone --depth 1 https://github.com/Microsoft/vcpkg.git & .\vcpkg\bootstrap-vcpkg.bat`
     - OpenCV: `.\vcpkg\vcpkg install "opencv[core]:x64-windows-release"`
     - OpenCL: `.\vcpkg\vcpkg install "opencl:x64-windows-release"`
-    - LLVM: https://github.com/llvm/llvm-project/releases/download/llvmorg-13.0.0/LLVM-13.0.0-win64.exe
+    - LLVM: download and install [LLVM](https://github.com/llvm/llvm-project/releases/download/llvmorg-13.0.0/LLVM-13.0.0-win64.exe)
 4. Make sure you have `7z` in PATH.
 5. Setup the environment in powershell (or set the same variables in cmd): `./__env.ps1` - I do this in VS Code built-in terminal
+    - some machines might have issue that scripts are forbidden to run, try to `set-executionpolicy remotesigned` in powershell with admin
 6. Compile and run: `cargo run --release`
 
 ### Building on MacOS

__env.ps1

@@ -1,5 +1,5 @@
 # Qt
-$Env:Path += ";$PSScriptRoot\ext\6.2.3\msvc2019_64\bin"
+$Env:Path = "$PSScriptRoot\ext\6.2.3\msvc2019_64\bin;$Env:Path"
 
 # FFmpeg
 $Env:FFMPEG_DIR = "$PSScriptRoot\ext\ffmpeg-4.4-windows-desktop-clang-gpl-lite"
@@ -10,8 +10,14 @@ $Env:OPENCV_LINK_LIBS = "opencv_core,opencv_calib3d,opencv_features2d,opencv_img
 $Env:OPENCV_LINK_LIBS += ",opencv_dnn,opencv_ml,opencv_highgui" # needed for debug build
 $Env:OPENCV_LINK_PATHS = "$PSScriptRoot\ext\vcpkg\installed\x64-windows-release\lib"
 $Env:OPENCV_INCLUDE_PATHS = "$PSScriptRoot\ext\vcpkg\installed\x64-windows-release\include"
-$Env:Path += ";$PSScriptRoot\ext\vcpkg\installed\x64-windows-release\bin"
+$Env:Path = ";$PSScriptRoot\ext\vcpkg\installed\x64-windows-release\bin;$Env:Path"
 
 # Clang
 $Env:LIBCLANG_PATH = "$PSScriptRoot\ext\llvm-13-win64\bin"
-$Env:Path += ";$PSScriptRoot\ext\llvm-13-win64\bin"
+$Env:Path = "$PSScriptRoot\ext\llvm-13-win64\bin;$Env:Path"
+# $Env:LIBCLANG_PATH = "D:\Program Files\LLVM\bin"
+# $Env:Path = "D:\Program Files\LLVM\bin;$Env:Path" # or other path if you have LLVM installed in other place
+
+# 7z
+# $Env:7Z_PATH = "C:\Program Files\7-Zip" # or other path if you have 7zip installed in other place
+# $Env:Path = "C:\Program Files\7-Zip;$Env:Path"