Add initial .editorconfig file

.editorconfig

@@ -0,0 +1,67 @@
+# EditorConfig for GLFW and its internal dependencies
+#
+# All files created by GLFW should indent with four spaces unless their format requires
+# otherwise.  A few files still use other indent styles for historical reasons.
+#
+# Dependencies have (what seemed to be) their existing styles described.  Those with
+# existing trailing whitespace have it preserved to avoid cluttering future commits.
+
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+
+[include/GLFW/*.h]
+indent_style = space
+indent_size = 4
+
+[{src,examples,tests}/*.{c,m,h,rc,in}]
+indent_style = space
+indent_size = 4
+
+[CMakeLists.txt]
+indent_style = space
+indent_size = 4
+
+[CMake/**.{cmake,in}]
+indent_style = space
+indent_size = 4
+
+[*.{dox,md}]
+indent_style = space
+indent_size = 4
+trim_trailing_whitespace = false
+
+[DoxygenLayout.xml]
+indent_style = space
+indent_size = 2
+
+[docs/*.{scss,html}]
+indent_style = tab
+indent_size = unset
+
+[deps/mingw/*.h]
+indent_style = space
+indent_size = 4
+tab_width = 8
+trim_trailing_whitespace = false
+
+[deps/getopt.{c,h}]
+indent_style = space
+indent_size = 2
+
+[deps/linmath.h]
+indent_style = tab
+tab_width = 4
+indent_size = 4
+trim_trailing_whitespace = false
+
+[deps/nuklear*.h]
+indent_style = space
+indent_size = 4
+
+[deps/tinycthread.{c,h}]
+indent_style = space
+indent_size = 2
+