account: split class logic out and have it building

Signed-off-by: Vincent Batts <vbatts@hashbangbash.com>

account.cpp

@@ -6,7 +6,8 @@ using namespace std;
 
 #include "account.h"
 
-int main(int argc, char* argv[]) {
-	Account	account(0.0);
-	return EXIT_SUCCESS;
+Account::Account ( double initial_balance ) : balance(initial_balance) {
+}
+
+Account::~Account () {
 }