ADD: added Catch2 test; added TrackClass

libs/Catch2/BUILD.bazel

@@ -0,0 +1,17 @@
+# Load the cc_library rule.
+load("@rules_cc//cc:defs.bzl", "cc_library")
+
+# Header-only rule to export catch2/catch.hpp.
+cc_library(
+    name = "catch2",
+    hdrs = ["single_include/catch2/catch.hpp"],
+    includes = ["single_include/"],
+    visibility = ["//visibility:public"],
+)
+
+cc_library(
+    name = "catch2_with_main",
+    srcs = ["src/catch_with_main.cpp"],
+    visibility = ["//visibility:public"],
+    deps = ["//:catch2"],
+)