Addinf basic makefile to support many C/C++ IDEs out there

Make file is configured by default to act identically as a default SCons
build. Baseic actions such as all and clean will be supported by default
by quite all IDE for building and rebuilding. Additionaly you can
configure your targets for release, debug or profile mode.

makefile

@@ -0,0 +1,30 @@
+#*************************************************************************/
+#*                       This file is part of:                           */
+#*                           GODOT ENGINE                                */
+#*                    http://www.godotengine.org                         */
+#*************************************************************************/
+# Simple makefile to give support for external C/C++ IDEs                */
+#*************************************************************************/
+
+# Default build
+all: debug
+
+# Release Build
+release:
+	scons target="release" bin/godot
+
+# Profile Build
+profile:
+	scons target="profile" bin/godot
+
+# Debug Build
+debug:
+	# Debug information (code size gets severely affected):
+	# g: Default (same as g2)
+	# g0: no debug info
+	# g1: minimal info
+	# g3: maximal info
+	scons target="debug" CCFLAGS="-g" bin/godot
+
+clean:
+	scons -c bin/godot