Update icu.net and README setup

Backend/BackendFramework.csproj

@@ -22,7 +22,7 @@
     <PackageReference Include="Xabe.FFmpeg" Version="5.2.6"/>
 
     <!-- SIL Maintained Dependencies. -->
-    <PackageReference Include="icu.net" Version="2.9.0" />
+    <PackageReference Include="icu.net" Version="2.10.0" />
     <PackageReference Include="Icu4c.Win.Full.Lib" Version="62.2.1-beta" />
     <PackageReference Include="SIL.Core" Version="14.1.1" />
     <PackageReference Include="SIL.Core.Desktop" Version="14.1.1">

README.md

@@ -97,10 +97,12 @@ A rapid word collection tool. See the [User Guide](https://sillsdev.github.io/Th
 
 2. [Chocolatey][chocolatey]: (Windows only) a Windows package manager.
 3. [Node.js 20 (LTS)](https://nodejs.org/en/download/)
+
    - On Windows, if using [Chocolatey][chocolatey]: `choco install nodejs-lts`
    - On Ubuntu, follow
      [this guide](https://github.com/nodesource/distributions/blob/master/README.md#installation-instructions) using the
      appropriate Node.js version.
+
 4. [.NET 8.0 SDK](https://dotnet.microsoft.com/download/dotnet/8.0)
 
    - On Ubuntu 20.02 or earlier, follow
@@ -126,6 +128,11 @@ A rapid word collection tool. See the [User Guide](https://sillsdev.github.io/Th
 7. [Python](#python): The Python section of this document has instructions for installing _Python 3_ on each of the
    supported platforms and how to setup your virtual environment.
 8. [FFmpeg](https://www.ffmpeg.org/download.html) and add its `/bin` to your PATH.
+
+- On Mac:
+  - If using [homebrew](https://brew.sh/): `brew install ffmpeg`
+  - If manually installing from the FFmpeg website, install both `ffmpeg` and `ffprobe`
+
 9. [dotnet-format](https://github.com/dotnet/format): `dotnet tool update --global dotnet-format --version 5.1.250801`
 10. [dotnet-reportgenerator](https://github.com/danielpalme/ReportGenerator)
     `dotnet tool update --global dotnet-reportgenerator-globaltool --version 5.0.4`