Create nuget package and push.

.github/workflows/build.yml

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+name: Push Build
+
+on:
+  push:
+
+jobs:
+  build:
+    runs-on: windows-latest
+
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v2
+      with:
+        clean: true
+        fetch-depth: 1
+
+    - name: Setup NuGet
+      uses: warrenbuckley/Setup-Nuget@v1
+
+    - name: Setup MSVC
+      uses: ilammy/msvc-dev-cmd@v1
+      #with:
+      #  arch: amd64
+      #  toolset: 16.0
+
+    - name: CMake
+      working-directory: .
+      run: cmake .
+
+    - name: Build Release
+      working-directory: ./build
+      run: msbuild /m /p:Configuration=Release FMT.sln
+      
+    - name: Build Debug
+      working-directory: ./build
+      run: msbuild /m /p:Configuration=Debug FMT.sln
+
+    - name: Nuget Pack
+      working-directory: .
+      run: nuget pack fmtlib.nuspec -version 6.1.2 -OutputFileNamesWithoutVersion -OutputDirectory dist
+      
+    - name: Nuget Push
+      working-directory: .
+      run: nuget push dist\fmtlib.nupkg

fmtlib.nuspec

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+<?xml version="1.0" encoding="utf-8"?>
+<package xmlns="http://schemas.microsoft.com/packaging/2011/08/nuspec.xsd">
+  <metadata>
+    <id>wuganhao.fmtlib</id>
+    <version>$version$</version>
+    <title>{fmt} lib nuget package</title>
+    <authors>Wu, Ganhao&lt;wuganhao@hotmail.com&gt;</authors>
+    <owners>Wu, Ganhao&lt;wuganhao@hotmail.com&gt;</owners>
+    <requireLicenseAcceptance>false</requireLicenseAcceptance>
+    <description>fmtlib</description>
+    <releaseNotes>Create fmtlib for VS 2019</releaseNotes>
+    <tags>fmtlib std::format</tags>
+  </metadata>
+  <files>
+    <file src="Debug\fmtd.lib" target="lib\native\x64\Debug\" />
+    <file src="Debug\fmtd.lib" target="lib\native\x64\Debug\" />
+    <file src="include\fmt\*.h" target="build\include\fmt\" />
+  </files>
+</package>