Added README.md document to LLGL/Backend/ folder.

include/LLGL/Backend/README.md

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+# Backend include files
+
+Use these include files (`*.inl`) to declare all required functions for the respective interface for your own renderer implementation. None of these headers are required for regular use of LLGL.
+
+## Example
+
+### `MyOwnRenderer.h`
+
+```cpp
+#include <LLGL/CommandBuffer.h>
+
+class MyOwnRenderer : public LLGL::CommandBuffer {
+public:
+ #include <LLGL/Backend/CommandBuffer.inl>
+public:
+ MyOwnRenderer();
+ ~MyOwnRenderer();
+private:
+ MyRendererData privateData;
+};
+```
+
+### `MyOwnRenderer.cpp`
+
+```cpp
+#include "MyOwnRenderer.h"
+
+MyOwnRenderer::MyOwnRenderer() {
+ /* Initialize OpenGL or Direct3D etc. */
+}
+MyOwnRenderer::~MyOwnRenderer() {
+ /* Clean up OpenGL or Direct3D etc. */
+}
+void MyOwnRenderer::Begin() {
+ /* Implements LLGL::CommandBuffer::Begin() ... */
+}
+void MyOwnRenderer::End() {
+ /* Implements LLGL::CommandBuffer::End() ... */
+}
+
+/* All other interface functions ... */
+```