Added README.md

README.md

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+# C++ project template with Google Tests and CI/CD
+
+This is a project template. Feel free to use it. It contains all pre-configured 
+CMakeLists.txt, so to use it, just replace project name with your in 
+[main CmakeLists.txt](CMakeLists.txt), and all target and executable names in 
+[CI/CD script](./.github/workflows/ci_tests.yml).
+
+## How to run
+
+Run following commands from project directory.
+
+1. Create CMake cache
+
+```shell
+cmake -S . -B cmake-build
+```
+
+2. Build main target
+
+```shell
+cmake --build cmake-build --target cpp_tests
+```
+
+3. Build tests target
+
+```shell
+cmake --build cmake-build --target cpp_tests_tests
+```
+
+4. Run main target
+
+* On Windows:
+
+```shell
+.\cmake-build\bin\cpp_tests.exe || .\cmake-build\bin\Debug\cpp_tests.exe
+```
+
+* On POSIX:
+
+```shell
+.\cmake-build\bin\cpp_tests
+```
+
+5. Run tests
+
+* On Windows:
+
+```shell
+.\cmake-build\bin\cpp_tests_tests.exe || .\cmake-build\bin\Debug\cpp_tests_tests.exe
+```
+
+* On POSIX:
+
+```shell
+.\cmake-build\bin\cpp_tests_tests
+```