setup basic godot-cpp example project

SConstruct

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+#!/usr/bin/env python
+import os
+import sys
+
+env = SConscript("./godot-cpp/SConstruct")
+
+# For the reference:
+# - CCFLAGS are compilation flags shared between C and C++
+# - CFLAGS are for C-specific compilation flags
+# - CXXFLAGS are for C++-specific compilation flags
+# - CPPFLAGS are for pre-processor flags
+# - CPPDEFINES are for pre-processor defines
+# - LINKFLAGS are for linking flags
+
+# tweak this if you want to use different folders, or more folders, to store your source code in.
+env.Append(CPPPATH=["src/"])
+sources = Glob("src/*.cpp")
+
+if env["platform"] == "macos":
+    library = env.SharedLibrary(
+        "demo/bin/libgdexample.{}.{}.framework/libgdexample.{}.{}".format(
+            env["platform"], env["target"], env["platform"], env["target"]
+        ),
+        source=sources,
+    )
+else:
+    library = env.SharedLibrary(
+        "demo/bin/libgdexample{}{}".format(env["suffix"], env["SHLIBSUFFIX"]),
+        source=sources,
+    )
+
+Default(library)