Add gitattributes

[donaldgray]

There are inconsistent line endings across files in the solution, which can lead to changes that are difficult to follow.

This should happen when develop / main branch is stable and there is nothing in flight as it'll touch a lot of files.

Introduce a .gitattributes file and then re-add all files to apply git add --all --renormalize

Suggested gitattr:

# Auto detect text files and perform LF normalization
*          text=auto

*.cs       text diff=csharp
*.cshtml   text diff=html
*.csx      text diff=csharp

# Documents
*.md       text diff=markdown
*.mdx      text diff=markdown
*.tex      text diff=tex
*.adoc     text
*.textile  text
*.mustache text
*.csv      text eol=lf
*.tab      text
*.tsv      text
*.txt      text
*.sql      text

# Graphics
*.png      binary
*.jpg      binary
*.jpeg     binary
*.gif      binary
*.tif      binary
*.tiff     binary
*.ico      binary
# SVG treated as text by default.
*.svg      text
# If you want to treat it as binary,
# use the following line instead.
# *.svg    binary
*.eps      binary

# Scripts
*.bash     text eol=lf
*.fish     text eol=lf
*.sh       text eol=lf
*.zsh      text eol=lf
# These are explicitly windows files and should use crlf
*.bat      text eol=crlf
*.cmd      text eol=crlf
*.ps1      text eol=crlf

# Serialisation
*.json     text
*.toml     text
*.xml      text
*.yaml     text
*.yml      text

# Archives
*.7z       binary
*.gz       binary
*.tar      binary
*.tgz      binary
*.zip      binary

# Text files where line endings should be preserved
*.patch    -text

#
# Exclude files from exporting
#

.gitattributes export-ignore
.gitignore     export-ignore
.gitkeep       export-ignore