more documentation, 12 more code snippets
diff --git a/doc/snippets/MatrixBase_random.cpp b/doc/snippets/MatrixBase_random.cpp
new file mode 100644
index 0000000..09b5fb2
--- /dev/null
+++ b/doc/snippets/MatrixBase_random.cpp
@@ -0,0 +1 @@
+cout << 100 * Matrix2i::random() << endl;