Update README.md

Author: NikosMav

README.md

@@ -4,13 +4,37 @@
 
 This program is a system programming assignment for the university course "Κ24 System Programming". It's designed to manage patient records using custom-implemented data structures that emulate the functionality of the Standard Template Library (STL).
 
-## Files and Modules
+### Compilation
+
+Compile the code using a C++ compiler:
+
+```bash
+g++ -o programName *.cpp -I.
+```
+
+### Execution
+
+Run the program with the following command:
+
+```bash
+./programName -p <patient_records_file> -h1 <disease_ht_entries> -h2 <country_ht_entries> -b <bucket_size>
+```
+
+### Examples of test files:
+
+- sample.txt: Contains a small set of sample records for quick testing.
+- sample2.txt: Contains a small set of sample records for quick testing.
+- small.txt: A larger dataset to test the program's performance and capabilities.
+- medium.txt: An even larger dataset
+- large.txt: An even larger dataset
+
+### Files and Modules
 
 - main.cpp: Initializes and orchestrates the data processing workflow.
 - diseaseMain.cpp: Handles disease-specific queries and operations.
 - .cpp and .h files: Contain custom data structures mimicking STL components like linked lists, AVL trees, hash tables, heaps, etc.
 
-## Project Structure
+### Project Structure
 
 The project is structured with separate .cpp and .h files for each custom data structure and utility function, providing a learning platform for system programming and data structure implementation.