Created Use raylib with Code Blocks (markdown)

Use-raylib-with-Code-Blocks.md

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+Guide provided by [Mark in raylib forum](http://forum.raylib.com/index.php?p=/discussion/133/raylib-in-code-blocks-a-how-to)
+
+First, under Project Settings check the box that says, *"This is a custom Makefile"*.
+
+Then, in your project's folder create a file named Makefile and paste the following:
+```make
+files = main.c
+output = main.exe
+
+Debug:
+	gcc -g -o obj\Debug\$(output) $(files) \
+		c:\raylib\raylib\raylib_icon \
+		-Ic:\raylib\raylib\src \
+		-Lc:\raylib\MinGW\bin \
+		-Lc:\raylib\MinGW\include\GLFW \
+		-Iexternal -lraylib -lglfw3 -lopengl32 -lgdi32 -lopenal32 -lwinmm \
+		-std=c99 -Wl,-allow-multiple-definition -Wl,--subsystem,windows -Wall
+
+Release:
+	gcc -s -o obj\Debug\$(output) $(files) \
+		c:\raylib\raylib\raylib_icon \
+		-Ic:\raylib\raylib\src \
+		-Lc:\raylib\MinGW\bin \
+		-Lc:\raylib\MinGW\include\GLFW \
+		-Iexternal -lraylib -lglfw3 -lopengl32 -lgdi32 -lopenal32 -lwinmm \
+		-std=c99 -Wl,-allow-multiple-definition -Wl,--subsystem,windows
+
+cleanDebug:
+	del /F /Q obj\Debug\*.*
+
+cleanRelease:
+	del /F /Q obj\Release\*.*
+```
+Change files and output variables as you see fit.