Normalize line endings to lf.

lf is used on linux and Mac.  Most of the code is lf already,
with items of crlf mixed in.  This will change future checkouts
to be lf only.

.gitattributes

@@ -0,0 +1,64 @@
+# Using recommended .gitattributes from
+# https://github.com/alexkaratarakis/gitattributes/blob/master/VisualStudio.gitattributes
+
+###################################
+# Set default diff settings
+###################################
+*.cs       text diff=csharp
+*.cshtml   text diff=html
+*.csx      text diff=csharp
+
+###############################################################################
+# Set default behavior to automatically normalize line endings.
+###############################################################################
+* text=auto
+
+###############################################################################
+# Set the merge driver for project and solution files
+#
+# Merging from the command prompt will add diff markers to the files if there
+# are conflicts (Merging from VS is not affected by the settings below, in VS
+# the diff markers are never inserted). Diff markers may cause the following 
+# file extensions to fail to load in VS. An alternative would be to treat
+# these files as binary and thus will always conflict and require user
+# intervention with every merge. To do so, just comment the entries below and
+# uncomment the group further below
+###############################################################################
+
+*.sln        text eol=lf
+*.csproj     text eol=lf
+*.vbproj     text eol=lf
+*.vcxproj    text eol=lf
+*.vcproj     text eol=lf
+*.dbproj     text eol=lf
+*.fsproj     text eol=lf
+*.lsproj     text eol=lf
+*.wixproj    text eol=lf
+*.modelproj  text eol=lf
+*.sqlproj    text eol=lf
+*.wmaproj    text eol=lf
+
+*.xproj      text eol=lf
+*.props      text eol=lf
+*.filters    text eol=lf
+*.vcxitems   text eol=lf
+
+
+#*.sln       merge=binary
+#*.csproj    merge=binary
+#*.vbproj    merge=binary
+#*.vcxproj   merge=binary
+#*.vcproj    merge=binary
+#*.dbproj    merge=binary
+#*.fsproj    merge=binary
+#*.lsproj    merge=binary
+#*.wixproj   merge=binary
+#*.modelproj merge=binary
+#*.sqlproj   merge=binary
+#*.wwaproj   merge=binary
+
+#*.xproj     merge=binary
+#*.props     merge=binary
+#*.filters   merge=binary
+#*.vcxitems  merge=binary
+