Written a better help message in case of invalid invocation.

AECforWebAssembly.cpp

@@ -53,8 +53,26 @@ int main(int argc, char **argv) {
                                // yet it miscompiles something every now and
                                // then in a 5'000-lines-of-code program.
         throw regex_error(error_complexity);
-      cerr << "Please invoke this program as follows:\n"
-           << argv[0] << " name_of_the_program.aec" << endl;
+      cerr << "Please invoke this program as follows, from the command line:\n"
+          << argv[0] << " name_of_the_program.aec" << '\n'
+          << "Or, alternatively, open an AEC source code with this program.\n"
+             "For more information, see:\n"
+             "https://flatassembler.github.io/AEC_specification.html#HowToCompile \n"
+             "TL;DR\n"
+             "An example AEC program can be downloaded here:\n"
+             "https://sourceforge.net/p/aecforwebassembly/code/ci/master/tree/analogClock/analogClock.aec?format=raw \n"
+             "You need to assemble the result using a program called \"wat2wasm\"\n"
+             "from WebAssembly Binary Toolkit, perhaps like this\n"
+             "(if you have NodeJS installed and an Internet connection):\n"
+             "npx -p wabt wat2wasm analogClock.wat\n"
+             "Then you need to write a JavaScript program runnable in NodeJS\n"
+             "which will invoke that AEC program, an example is available here:\n"
+             "https://sourceforge.net/p/aecforwebassembly/code/ci/master/tree/analogClock/analogClock.js?format=raw \n"
+             "And then, of course, you can run that program in NodeJS."
+          <<endl;
+#ifdef WIN32
+      system("PAUSE");
+#endif // WIN32
       return -1;
     }
   } catch (regex_error &error) {