Add a .gitattributes file to specify eol=LF (bytecodealliance#1370)

* Add a .gitattributes file specifying LF-style line endings.

This is similar to [Rust's .gitattributes file] though simplified.
Most of our source and documentation files already used LF-style line
endings, including *.cs files, so this makes things more consistent.

[Rust's .gitattributes file]: https://github.com/rust-lang/rust/blob/master/.gitattributes

* Remove UTF-8 BOMs in *.cs files.

Most of our *.cs files don't have UTF-8 BOMs, so this makes things more
consistent.

Author: sunfishcode

.gitattributes

@@ -0,0 +1,7 @@
+# Use LF-style line endings for all text files.
+* text=auto eol=lf
+
+# Older git versions try to fix line endings on images, this prevents it.
+*.png binary
+*.ico binary
+*.wasm binary

crates/misc/dotnet/docs/.gitignore

@@ -1,9 +1,9 @@
-###############
-#    folder   #
-###############
-/**/DROP/
-/**/TEMP/
-/**/packages/
-/**/bin/
-/**/obj/
-_site
+###############
+#    folder   #
+###############
+/**/DROP/
+/**/TEMP/
+/**/packages/
+/**/bin/
+/**/obj/
+_site

crates/misc/dotnet/docs/api/.gitignore

@@ -1,5 +1,5 @@
-###############
-#  temp file  #
-###############
-*.yml
-.manifest
+###############
+#  temp file  #
+###############
+*.yml
+.manifest

crates/misc/dotnet/docs/api/index.md

@@ -1,5 +1,5 @@
-# Wasmtime for NET
-
-This is the .NET API for [Wasmtime](https://github.com/bytecodealliance/wasmtime).
-
+# Wasmtime for NET
+
+This is the .NET API for [Wasmtime](https://github.com/bytecodealliance/wasmtime).
+
 See the [documentation](Wasmtime.html#classes) for the various .NET classes.