Added .editorconfig

Author: xperiandri

.editorconfig

@@ -0,0 +1,13 @@
+# All files
+[*]
+end_of_line              = crlf
+indent_style             = space
+insert_final_newline     = true
+trim_trailing_whitespace = true
+# Project files
+[*.{csproj,fsproj}]
+indent_size          = 2
+# Code files
+[*.{cs,csx,fs,fsx,vb,vbx,xml}]
+indent_size          = 4
+charset              = utf-8-bom

FSharp.Control.AsyncSeq.sln

@@ -1,6 +1,6 @@
 Microsoft Visual Studio Solution File, Format Version 12.00
-# Visual Studio 15
-VisualStudioVersion = 15.0.27004.2006
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.29924.181
 MinimumVisualStudioVersion = 15.0.26124.0
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = ".paket", ".paket", "{63297B98-5CED-492C-A5B7-A5B4F73CF142}"
 	ProjectSection(SolutionItems) = preProject
@@ -10,6 +10,7 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = ".paket", ".paket", "{63297B
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "project", "project", "{BF60BC93-E09B-4E5F-9D85-95A519479D54}"
 	ProjectSection(SolutionItems) = preProject
+		.editorconfig = .editorconfig
 		.gitignore = .gitignore
 		.travis.yml = .travis.yml
 		appveyor.yml = appveyor.yml