chore: add version bump up manual

.gitignore

@@ -11,6 +11,7 @@ build/*
 !build/create_lang_nuspec_file.py
 !build/create_nupkg_file.ps1
 !build/build.ps1
+!build/version-bump-up-manual.md
 !build/LICENSE
 !build/icon.png
 !build/tools/

build/version-bump-up-manual.md

@@ -0,0 +1,11 @@
+- modify copyright of LICENSE
+- modify copyright of build/LICENSE
+- modify version and copyright of src/Directory.Build.Props
+- modify version, copyright and repository of build/build.nuspec
+- modify version, copyright and repository of build/build.Lang.template
+- modify version, copyright and repository of build/build-for-myget.nuspec
+- run build/build.ps1
+- run create_lang_nuspec_file.py
+- run create_nupkg_file.ps1
+- upload nupkg and snupkg to nuget
+- draft and publish a new release on github.