Added ImGuizmo source files

Author: PR3C14D0

include/ImGuizmo/.editorconfig

@@ -0,0 +1,11 @@
+root = true
+
+[*]
+indent_style    = space
+indent_size     = 3
+end_of_line     = lf
+insert_final_newline     = true
+trim_trailing_whitespace = true
+
+[*.md]
+trim_trailing_whitespace = false

include/ImGuizmo/.gitignore

@@ -0,0 +1,6 @@
+build/
+.*/
+*.vcxproj.user
+example/x64/
+example/x86/
+example/imgui.ini