Add more examples

Signed-off-by: Slendi <slendi@socopon.com>

examples/random_steps.cpp

@@ -0,0 +1,43 @@
+/*
+ * smath - Single-file linear algebra math library for C++23.
+ *
+ * Copyright 2025 Slendi <slendi@socopon.com>
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * You can define the following macros to change functionality:
+ * - SMATH_IMPLICIT_CONVERSIONS
+ */
+
+#include <print>
+#include <random>
+
+#include <smath.hpp>
+
+auto main() -> int {
+  using namespace smath;
+
+  Vec2d point;
+  std::random_device rd;
+  std::mt19937 rng{rd()};
+  std::uniform_real_distribution<> dis(-5, 5);
+  int i = 0;
+  do {
+    Vec2d add{dis(rng), dis(rng)};
+    auto const n = point + add;
+    std::println("{}: {:.2f} + {:.2f} -> {:.2f}", i, point, add, n);
+    point = n;
+
+    i++;
+  } while (i < 15);
+}