feat: add sum

[d-cheholia]

No description provided.

[github-actions]

Here is the summarized build result:
5. Executing build steps
5.1. [ 1/2 ] Print Hello world - Success
5.2. [ 2/2 ] clang-format - Failed
5.3. Collecting artifacts for the 'clang-format' step - Success

Here is the link to Github Actions build: https://github.com/d-cheholia/code-examples/actions/runs/7727788871

[github-actions]

Code Style issue:
Original code:

↓
int·main(·void····)······{↓

Fixed code:

↓
int·main(void)·{↓

[github-actions]

Code Style issue:
Original code:

····sum·=·one·+·two;↓
····std::cout·<<·"The·sum·of·"·<<·one·<<·"·and·"·<<·two·<<·"·is·"·<<·sum·<<·std::endl;↓
·}```
Fixed code:
```diff
····sum·=·one·+·two;↓
····std::cout·<<·"The·sum·of·"·<<·one·<<·"·and·"·<<·two·<<·"·is·"·<<·sum↓
··············<<·std::endl;↓
}```

[github-actions]

Cpp-Linter Report ⚠️

Some files did not pass the configured checks!

clang-format reports: 1 file(s) not formatted

• show_sum/main.cpp

clang-tidy reports: 3 concern(s)

• show_sum/main.cpp

  show_sum/main.cpp:4:12: warning: [cppcoreguidelines-init-variables]

  variable 'one' is not initialized

      size_t one;
             ^
                 = 0

  show_sum/main.cpp:5:12: warning: [cppcoreguidelines-init-variables]

  variable 'two' is not initialized

      size_t two;
             ^
                 = 0

  show_sum/main.cpp:6:12: warning: [cppcoreguidelines-init-variables]

  variable 'sum' is not initialized

      size_t sum;
             ^
                 = 0

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