reorganize to use .bat files instead of .sh. Move demo to an example project

build.bat

@@ -0,0 +1,10 @@
+@ECHO off
+SET flags=-Od -ZI -MDd
+IF "%1" == "release" (
+    SET flags=-O2 -MTd
+)
+SET srcs=src\*
+mkdir bin obj
+cl %srcs% ext\glfw\build\src\Debug\glfw3.lib kernel32.lib user32.lib Gdi32.lib Shell32.lib -I inc -I ext\glm -I ext\glfw\include %flags% -std:c++20 -MP -LD -Fo:obj\\ -Fe:bin\\LivePlotter.dll
+COPY /Y assets\* bin
+COPY /Y assets\shaders\* bin