Add tutorial READMEs and fix tutorial return codes

Add README.md files for moeo/tutorial/Lesson{1-4}, smp/tutorial/Lesson{1-4},
and mo/tutorial/Lesson9 — these tutorials had no documentation.

Fix return 1 → return 0 in 28 tutorial main() functions across mo/ and
smp/ that unconditionally returned failure status.

mo/tutorial/Lesson1/firstImprHC_maxSAT.cpp

@@ -218,5 +218,5 @@ int main(int argc, char **argv)
     catch (exception& e) {
         cout << "Exception: " << e.what() << '\n';
     }
-    return 1;
+    return 0;
 }

mo/tutorial/Lesson1/lesson1_combinedContinuator.cpp

@@ -247,5 +247,5 @@ int main(int argc, char **argv)
     catch (exception& e) {
         cout << "Exception: " << e.what() << '\n';
     }
-    return 1;
+    return 0;
 }

mo/tutorial/Lesson1/lesson1_evalContinuator.cpp

@@ -214,5 +214,5 @@ int main(int argc, char **argv)
     catch (exception& e) {
         cout << "Exception: " << e.what() << '\n';
     }
-    return 1;
+    return 0;
 }

mo/tutorial/Lesson1/lesson1_firstImprHC.cpp

@@ -192,5 +192,5 @@ int main(int argc, char **argv)
     catch (exception& e) {
         cout << "Exception: " << e.what() << '\n';
     }
-    return 1;
+    return 0;
 }

mo/tutorial/Lesson1/lesson1_fitContinuator.cpp

@@ -209,5 +209,5 @@ int main(int argc, char **argv)
     catch (exception& e) {
         cout << "Exception: " << e.what() << '\n';
     }
-    return 1;
+    return 0;
 }

mo/tutorial/Lesson1/lesson1_fullEvalContinuator.cpp

@@ -214,5 +214,5 @@ int main(int argc, char **argv)
     catch (exception& e) {
         cout << "Exception: " << e.what() << '\n';
     }
-    return 1;
+    return 0;
 }

mo/tutorial/Lesson1/lesson1_iterContinuator.cpp

@@ -211,5 +211,5 @@ int main(int argc, char **argv)
     catch (exception& e) {
         cout << "Exception: " << e.what() << '\n';
     }
-    return 1;
+    return 0;
 }

mo/tutorial/Lesson1/lesson1_neutralHC.cpp

@@ -196,5 +196,5 @@ int main(int argc, char **argv)
     catch (exception& e) {
         cout << "Exception: " << e.what() << '\n';
     }
-    return 1;
+    return 0;
 }

mo/tutorial/Lesson1/lesson1_randomBestHC.cpp

@@ -192,5 +192,5 @@ int main(int argc, char **argv)
     catch (exception& e) {
         cout << "Exception: " << e.what() << '\n';
     }
-    return 1;
+    return 0;
 }

mo/tutorial/Lesson1/lesson1_simpleHC.cpp

@@ -193,5 +193,5 @@ int main(int argc, char **argv)
     catch (exception& e) {
         cout << "Exception: " << e.what() << '\n';
     }
-    return 1;
+    return 0;
 }

mo/tutorial/Lesson2/testNeighborhood.cpp

@@ -237,5 +237,5 @@ int main(int argc, char **argv)
     catch (exception& e) {
         cout << "Exception: " << e.what() << '\n';
     }
-    return 1;
+    return 0;
 }

mo/tutorial/Lesson3/testSimulatedAnnealing.cpp

@@ -228,5 +228,5 @@ int main(int argc, char **argv)
     catch (exception& e) {
         cout << "Exception: " << e.what() << '\n';
     }
-    return 1;
+    return 0;
 }

mo/tutorial/Lesson4/testSimpleTS.cpp

@@ -262,5 +262,5 @@ int main(int argc, char **argv)
     catch (exception& e) {
         cout << "Exception: " << e.what() << '\n';
     }
-    return 1;
+    return 0;
 }

mo/tutorial/Lesson5/testILS.cpp

@@ -226,5 +226,5 @@ int main(int argc, char **argv)
     catch (exception& e) {
         cout << "Exception: " << e.what() << '\n';
     }
-    return 1;
+    return 0;
 }

mo/tutorial/Lesson6/adaptiveWalks.cpp

@@ -207,5 +207,5 @@ int main(int argc, char **argv)
     catch (exception& e) {
         cout << "Exception: " << e.what() << '\n';
     }
-    return 1;
+    return 0;
 }

mo/tutorial/Lesson6/autocorrelation.cpp

@@ -222,5 +222,5 @@ int main(int argc, char **argv)
     catch (exception& e) {
         cout << "Exception: " << e.what() << '\n';
     }
-    return 1;
+    return 0;
 }

mo/tutorial/Lesson6/densityOfStates.cpp

@@ -190,5 +190,5 @@ int main(int argc, char **argv)
     catch (exception& e) {
         cout << "Exception: " << e.what() << '\n';
     }
-    return 1;
+    return 0;
 }

mo/tutorial/Lesson6/fdc.cpp

@@ -188,5 +188,5 @@ int main(int argc, char **argv)
     catch (exception& e) {
         cout << "Exception: " << e.what() << '\n';
     }
-    return 1;
+    return 0;
 }

mo/tutorial/Lesson6/fitnessCloud.cpp

@@ -213,5 +213,5 @@ int main(int argc, char **argv)
     catch (exception& e) {
         cout << "Exception: " << e.what() << '\n';
     }
-    return 1;
+    return 0;
 }

mo/tutorial/Lesson6/neutralDegree.cpp

@@ -211,5 +211,5 @@ int main(int argc, char **argv)
     catch (exception& e) {
         cout << "Exception: " << e.what() << '\n';
     }
-    return 1;
+    return 0;
 }