Document WinGet install

Author: gitRasheed

README.md

@@ -12,6 +12,10 @@ UI for them yet.
 
 ## Install
 
+```powershell
+winget install mathom
+```
+
 Download the MSI, setup.exe, or portable zip from [Releases](../../releases).
 
 Not code-signed yet, so SmartScreen warns on first run: "More info", then

docs/index.html

@@ -243,6 +243,7 @@ <h2>An alternative to WinDirStat, WizTree, and TreeSize</h2>
     <section class="install" id="get">
       <h2>Get mathom</h2>
       <div class="box">
+        <code>winget install mathom</code>
         <a class="btn primary" href="https://github.com/gitRasheed/mathom/releases/latest">Download for Windows</a>
         <div class="alt">
           MSI, setup.exe, or portable zip from