chore: add auto pack nupkg file script.

.gitignore

@@ -7,7 +7,9 @@ packages/
 build/*
 !build/build.cake
 !build/build*.nuspec
+!build/build.Lang.template
 !build/create_lang_nuspec_file.py
+!build/create_nupkg_file.ps1
 !build/build.ps1
 !build/LICENSE
 !build/icon.png

build/create_lang_nuspec_file.py

@@ -2,7 +2,7 @@ from pathlib import Path
 
 
 def main():
-    with open('build.Lang.template.nuspec', 'r', encoding='utf-8') as template_file:
+    with open('build.Lang.template', 'r', encoding='utf-8') as template_file:
         template_content = template_file.read()
 
     resx_file_folder = Path('../src/Shared/HandyControl_Shared/Properties/Langs')

build/create_nupkg_file.ps1

@@ -0,0 +1,4 @@
+./tools/nuget pack build.nuspec -Symbols -SymbolPackageFormat snupkg
+Get-ChildItem -Path ./build.Lang.*.nuspec | ForEach-Object {
+    ./tools/nuget pack $_
+}