Setup basic CI pipeline

.github/workflows/ci.yml

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+name: Test Build
+
+on:
+  push:
+    branches: [ master ]
+  pull_request:
+    branches: [ master ]
+
+jobs:
+  build:
+    runs-on: windows-2022
+    steps:
+      - uses: actions/checkout@v3
+      - name: Setup NuGet.exe
+        uses: nuget/setup-nuget@v1
+        with:
+          nuget-version: latest
+      - name: Cache NuGet packages
+        uses: actions/cache@v3
+        with:
+          path: packages
+          key: nuget-${{ runner.os }}-test-android
+      - name: Add msbuild to PATH
+        uses: microsoft/setup-msbuild@v1.1
+      - name: Install dependencies
+        run: nuget restore NeptunLight.sln
+      - name: Build
+        run: msbuild NeptunLight/NeptunLight.Android/NeptunLight.Android.csproj /verbosity:normal /t:PackageForAndroid /p:Configuration=Release

nuget.config

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+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+    <config>
+        <add key="globalPackagesFolder" value="packages" />
+    </config>
+    <packageRestore>
+        <add key="enabled" value="True" />
+        <add key="automatic" value="True" />
+    </packageRestore>
+    <packageSourceCredentials />
+</configuration>