feat(GradeCalc,GradeDeterm): Add documention

doc/nodes/FinalGradeDeterminator.md

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+# FinalGradeDeterminator (`assignments::one::final_grade_determinator`)
+
+## Overview
+The `FinalGradeDeterminator` node collects exam results for student-course combinations, triggers grade calculation when enough results are gathered, and stores final grades in the database. It interacts with ROS2 publishers, subscribers, and service clients to manage the grading workflow.
+
+#### Implementation Details
+
+**Constructor**
+```cpp
+FinalGradeDeterminator()
+```
+- Initializes ROS2 node with name `final_grade_determinator`
+- Declares and retrieves `grade_collection_amount` parameter
+- Sets up `DatabaseManager` <!--(uses provided or creates new instance) std::unique_ptr<DatabaseManager> db_manager -->
+- Creates publisher for student course management
+- Subscribes to exam results topic
+- Initializes service client for grade calculation
+
+**Core Functions**
+
+**`void exam_results_callback(const g2_2025_interfaces::msg::Exam::SharedPtr msg)`**
+- Updates internal map with received exam result for student-course combo
+- Checks if enough results have been collected
+- Triggers grade calculation request when threshold is met
+
+**`void grade_calculator_request(StudentCourse combo)`**
+- Waits for grade calculator service to be available
+- Sends async request with collected exam grades for the student-course combination
+- Uses callback to handle service response
+
+**`void grade_calculator_response(rclcpp::Client<g2_2025_interfaces::srv::Exams>::SharedFuture future, StudentCourse studentCourseCombo)`**
+- Verifies database connection
+- Publishes final student message to ROS2 topic
+- Logs final grade information
+- Stores final course result in database

doc/nodes/GradeCalculator.md

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+# GradeCalculator (`assignments::one::grade_calculator::GradeCalculator`)
+
+## Overview
+The `GradeCalculator` node provides a ROS2 service for calculating student exam grades. It processes exam scores, applies custom logic for specific student names, and ensures grade results are within valid bounds.
+
+#### Implementation Details
+
+**Constructor**
+```cpp
+GradeCalculator()
+```
+- Initializes ROS2 node with name `grade_calculator`
+- Creates a ROS2 service server for `grade_calculator_service`
+- Binds the service callback to handle grade calculation requests
+- Logs service startup
+
+**Core Functions**
+
+**`void grade_calculator_callback(const Exams::Request::SharedPtr request, const Exams::Response::SharedPtr response)`**
+- Checks if exam grades are provided
+- Calculates the total and average of exam grades
+- Converts student name to lowercase for comparison
+- Adds a bonus of 10 points if the student name is "wessel"
+- Ensures the final grade is clamped between 10 and 100
+- Sends the calculated grade back through the service response