Supply a CMake project and a trivial unit test

Source/Engine/Gramambular/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.17)
+project(Gramambular)
+
+set(CMAKE_CXX_STANDARD 17)
+
+add_library(GramambularLib Bigram.h BlockReadingBuilder.h Gramambular.h Grid.h Grid.cpp KeyValuePair.h LanguageModel.h Node.h NodeAnchor.h Span.h Unigram.h Walker.h)
+
+# Let CMake fetch Google Test for us.
+# https://github.com/google/googletest/tree/main/googletest#incorporating-into-an-existing-cmake-project
+include(FetchContent)
+
+FetchContent_Declare(
+        googletest
+        # Specify the commit you depend on and update it regularly.
+        URL https://github.com/google/googletest/archive/609281088cfefc76f9d0ce82e1ff6c30cc3591e5.zip
+)
+# For Windows: Prevent overriding the parent project's compiler/linker settings
+set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
+FetchContent_MakeAvailable(googletest)
+
+# Test target declarations.
+add_executable(GramambularTest GramambularTest.cpp)
+target_link_libraries(GramambularTest gtest_main GramambularLib)
+include(GoogleTest)
+gtest_discover_tests(GramambularTest)
+
+add_custom_target(
+        runTest
+        COMMAND ${CMAKE_CURRENT_BINARY_DIR}/GramambularTest
+)
+add_dependencies(runTest GramambularTest)

Source/Engine/Gramambular/GramambularTest.cpp

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+// Copyright (c) 2022 and onwards Lukhnos Liu
+//
+// Permission is hereby granted, free of charge, to any person
+// obtaining a copy of this software and associated documentation
+// files (the "Software"), to deal in the Software without
+// restriction, including without limitation the rights to use,
+// copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the
+// Software is furnished to do so, subject to the following
+// conditions:
+//
+// The above copyright notice and this permission notice shall be
+// included in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+// OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+// WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+// OTHER DEALINGS IN THE SOFTWARE.
+
+#include "gtest/gtest.h"
+
+TEST(GramambularTest, Trivial) {
+  ASSERT_EQ(1, 1);
+}