New cpp folder structure

Signed-off-by: Alexander Borsuk <me@alex.bio>

libs/coding/coding_tests/sparse_vector_tests.cpp

@@ -0,0 +1,28 @@
+#include "testing/testing.hpp"
+
+#include "coding/sparse_vector.hpp"
+
+UNIT_TEST(SparseVector_Smoke)
+{
+  uint32_t const arr[] = { 0, 0, 5, 0, 7, 1000, 0, 0, 1, 0 };
+  uint64_t const count = std::size(arr);
+
+  coding::SparseVectorBuilder<uint32_t> builder(count);
+  for (uint32_t v : arr)
+  {
+    if (v == 0)
+      builder.PushEmpty();
+    else
+      builder.PushValue(v);
+  }
+
+  auto vec = builder.Build();
+
+  TEST_EQUAL(vec.GetSize(), count, ());
+  for (size_t i = 0; i < count; ++i)
+  {
+    TEST_EQUAL(vec.Has(i), (arr[i] != 0), ());
+    if (arr[i] != 0)
+      TEST_EQUAL(vec.Get(i), arr[i], ());
+  }
+}