Update .editorconfig with some more configs

Added support for .awk, .w32, .bat, .mk, .frag, .m4, .sh, .php, .phpt,
and Markdown files based on the current most used coding style in the
php-src repository.

Author: petk

.editorconfig

@@ -1,16 +1,35 @@
-; http://editorconfig.org/
+# http://editorconfig.org/
 
 root = true
 
-[*.{c,h}]
-charset                  = UTF-8
-end_of_line              = LF
+[*.{c,h,awk,w32,bat,mk,frag}]
+charset                  = utf-8
+end_of_line              = lf
 indent_size              = 4
 indent_style             = tab
-insert_final_newline     = true
 tab_width                = 4
 trim_trailing_whitespace = true
+insert_final_newline     = true
+
+[*.{php,phpt}]
+charset                  = utf-8
+end_of_line              = lf
+indent_size              = 4
+indent_style             = space
+trim_trailing_whitespace = true
+insert_final_newline     = true
 
-[*.yml]
+[*.{yml,m4,sh}]
+charset                  = utf-8
+end_of_line              = lf
 indent_size              = 2
 indent_style             = space
+trim_trailing_whitespace = true
+insert_final_newline     = true
+
+[*.md]
+charset                  = utf-8
+end_of_line              = lf
+indent_style             = space
+trim_trailing_whitespace = false
+insert_final_newline     = true