Add code guideliness and remove redundant gitignore file

README.md

@@ -1,2 +1,63 @@
 # simple-text-communicator
-![Diagram UML](/res/diagram_uml)
+![Diagram UML](/res/diagram_uml)
+
+### Code Guidelines
+
+1. **Class Naming Conventions:**
+   - Class names should begin with a capital letter, following CamelCase convention. For example: `DatabaseHandler`.
+
+2. **Private Class Members:**
+   - Private class members should be named with an underscore suffix. For instance, `int m_counter`.
+
+3. **Variable Naming:**
+   - Use meaningful and descriptive names for variables.
+   - Follow camelCase convention for variable names.
+   - Avoid single-letter names or abbreviations unless they are widely recognized.
+   - Global variables should be avoided whenever possible. If needed, prefix them with "g_" for clarity.
+
+4. **Function Naming:**
+   - Use verbs or verb phrases to describe functions' actions.
+   - Follow camelCase convention for function names and function arguments
+
+5. **Comments:**
+   - Use comments to explain complex algorithms, non-trivial decisions, or any code that might be unclear.
+   - Comments should be clear, concise, and written in English.
+   - Avoid redundant comments that merely restate the code.
+
+6. **Indentation and Formatting:**
+   - Use formatting from .clang-format(in VS code ctrl + shift + i)
+
+7. **Error Handling:**
+   - Always handle errors gracefully. Use exceptions where appropriate.
+   - Use descriptive error messages for better debugging and maintenance.
+
+8. **Memory Management:**
+   - Prefer smart pointers (e.g., `std::unique_ptr`, `std::shared_ptr`) over raw pointers whenever possible.
+   - Use RAII (Resource Acquisition Is Initialization) principle for resource management.
+
+9. **Const-Correctness:**
+   - Utilize `const` keyword appropriately to indicate immutability where applicable.
+   - Prefer `const` references over pass-by-value for function parameters when the parameter won't be modified.
+
+10. **Code Reusability and Modularity:**
+    - Write modular and reusable code.
+    - Break down complex functionalities into smaller, more manageable functions or classes.
+
+11. **Standard Library Usage:**
+    - Utilize features provided by the C++ Standard Library whenever possible rather than reinventing the wheel.
+
+12. **Naming Conventions for Constants:**
+    - Constants should be all uppercase with underscores separating words. For example: `const int MAX_SIZE = 100;`.
+
+13. **File Organization:**
+    - Each class declaration and its implementation should reside in separate header (.h) and source (.cpp) files, respectively.
+    - Group related header files in a separate directory (e.g., `include`).
+
+14. **Version Control:**
+    - Utilize version control systems (e.g., Git) effectively.
+    - Commit regularly with meaningful commit messages.
+    - Please squash your commits before you push it to remote repository
+
+15. **Testing:**
+    - Write comprehensive unit tests to validate the correctness of the code.
+    - Test edge cases and unexpected inputs.