added a README

README.md

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+Tests include:
+
+**ClearScreen**
+Clears the screen to CornflowerBlue. Mostly useful as a smoke test to make sure basic device init and render passes are working as intended.
+
+**ClearScreen_MultiWindow**
+Similar to above, but with two windows. Useful for testing window claim/unclaim logic and presenting to multiple swapchains.
+
+**BasicTriangle**
+Sets up a graphics pipeline and draws a triangle without vertex buffers. (The vertices are manually positioned in the vertex shader.) Also tests some basic rasterizer state with custom viewports, scissor rects, and fill/wireframe modes.
+
+**TriangleVertexBuffer**
+Similar to above, but using a MoonWorks vertex buffer and custom vertex structs.
+
+**TexturedQuad**
+Draws a textured quad to the screen. Tests texture binding, index buffers, and sampler states.
+
+**AnimatedTexturedQuad**
+Similar to above, but with rotating and color-blending animations. Tests vertex and fragment uniforms.
+
+**MSAA**
+Draws a basic triangle with varying MSAA sample counts.
+
+**CullMode**
+Draws several triangles with various culling modes and winding orders.