Add tinygltf library

source/lib/tinygltf/CMakeLists.txt

@@ -0,0 +1,22 @@
+cmake_minimum_required(VERSION 3.5)
+
+project(tinygltf
+  VERSION 2.6.3
+  DESCRIPTION "Header only C++11 tiny glTF 2.0 library"
+  LANGUAGES CXX
+)
+
+add_library(tinygltf INTERFACE)
+add_library(tinygltf::tinygltf ALIAS tinygltf)
+
+target_compile_definitions(tinygltf
+  INTERFACE
+    TINYGLTF_NO_EXTERNAL_IMAGE 
+    TINYGLTF_NO_STB_IMAGE
+    TINYGLTF_NO_STB_IMAGE_WRITE
+)
+
+target_include_directories(tinygltf
+  INTERFACE
+    "${CMAKE_CURRENT_SOURCE_DIR}"
+)