Add per-user Windows installer and build instructions

installer/Build-Installer.ps1

@@ -0,0 +1,12 @@
+param([string]$IsccPath = "${env:ProgramFiles(x86)}\Inno Setup 7\ISCC.exe")
+$ErrorActionPreference = 'Stop'
+$projectRoot = Split-Path $PSScriptRoot -Parent
+if (!(Test-Path -LiteralPath $IsccPath)) { throw "Inno Setup compiler not found. Supply -IsccPath with the path to ISCC.exe." }
+Push-Location $projectRoot
+try {
+    dotnet publish Orbit.csproj -c Release -r win-x64 --self-contained true -p:PublishSingleFile=false -p:DebugType=None -p:DebugSymbols=false -o release/installer-payload
+    if ($LASTEXITCODE -ne 0) { throw 'Publish failed.' }
+    Copy-Item README.txt release/installer-payload/README.txt
+    & $IsccPath installer/Orbit.iss
+    if ($LASTEXITCODE -ne 0) { throw 'Installer compilation failed.' }
+} finally { Pop-Location }

installer/Orbit.iss

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+#define AppVersion GetVersionNumbersString("..\release\installer-payload\Orbit.exe")
+[Setup]
+AppId={{60E686D4-296A-41D2-B445-5DDC79FD2A2C}
+AppName=Orbit
+AppVersion={#AppVersion}
+AppPublisher=Dario P.
+AppPublisherURL=https://github.com/donishki/orbit
+AppSupportURL=https://github.com/donishki/orbit/issues
+AppUpdatesURL=https://github.com/donishki/orbit/releases/latest
+DefaultDirName={localappdata}\Programs\Orbit
+DefaultGroupName=Orbit
+DisableProgramGroupPage=yes
+PrivilegesRequired=lowest
+ArchitecturesAllowed=x64compatible
+ArchitecturesInstallIn64BitMode=x64compatible
+MinVersion=10.0
+OutputDir=..\release
+OutputBaseFilename=Orbit-Setup-win-x64
+SetupIconFile=..\app.ico
+UninstallDisplayIcon={app}\Orbit.exe
+UninstallDisplayName=Orbit
+WizardStyle=modern
+Compression=lzma2
+SolidCompression=yes
+CloseApplications=yes
+RestartApplications=no
+
+[Tasks]
+Name: "desktopicon"; Description: "Create a &desktop shortcut"; GroupDescription: "Shortcuts:"; Flags: unchecked
+
+[Files]
+Source: "..\release\installer-payload\*"; DestDir: "{app}"; Flags: ignoreversion recursesubdirs createallsubdirs
+
+[Icons]
+Name: "{autoprograms}\Orbit"; Filename: "{app}\Orbit.exe"; WorkingDir: "{app}"
+Name: "{autodesktop}\Orbit"; Filename: "{app}\Orbit.exe"; WorkingDir: "{app}"; Tasks: desktopicon
+
+[Run]
+Filename: "{app}\Orbit.exe"; Description: "Launch Orbit"; Flags: nowait postinstall skipifsilent
+
+; Deliberately do not remove the user's %LOCALAPPDATA%\Orbit settings on uninstall.