Merge pull request #10 from Jan5366x/release/v4_0_0

v 4.0.0 merge

Add .net version note to the readme

Bump nuget package version

Merge pull request #2 from Jan5366x/net6_and_manual_write_and_read

Net6 and manual write and read

Add fallback encoding to read all text; Add upgrade guide

Adjust nuget package meta data

Remove CodePages reference; Update readme; Bump to 1.0.0

Adjust package version

Adjust package version to 1.0.0-preview.2

Add nuget package info to readme and project file