docs: Add detailed documentation for multithreading and hashing workshop

README.md

@@ -1,2 +1,256 @@
-# WS-07-Multithreading-Basics-and-Hashing
+# WS-07 – Multithreading Basics and Hashing
 
+---
+
+## Mini Student Search Engine
+
+### Goal
+
+Create a simple student search engine that:
+
+1. Reads students from a file
+2. Processes data using multiple threads
+3. Stores students inside lists
+4. Supports search by ID
+5. Overrides `hashCode()` and `equals()`
+
+---
+
+## Project Structure
+
+```
+WS-07-Multithreading-Basics-and-Hashing/
+│
+├── students.txt
+│
+├── src/main/java/dev/
+│   │
+│   ├── Main.java
+│   │
+│   ├── model/
+│   │   └── Student.java
+│   │
+│   ├── thread/
+│   │   └── StudentLoader.java
+│   │
+│   ├── service/
+│   │   └── StudentManager.java
+│   │
+│   └── utils/
+│       └── FileManager.java
+│
+└── README.md
+```
+
+---
+
+## Input File
+
+`students.txt`
+
+```txt
+1001,Ali,Computer Science,3.7
+1002,Sara,Physics,3.9
+1003,John,Mathematics,3.5
+1004,Alice,Chemistry,3.2
+1005,David,Computer Science,3.8
+```
+
+Format:
+
+```txt
+id,name,major,gpa
+```
+
+---
+
+## Part 1 – Student Class
+
+Create:
+
+```java
+Student
+```
+
+Fields:
+
+```java
+int id;
+String name;
+String major;
+double gpa;
+```
+
+Override:
+
+```java
+hashCode()
+
+equals(Object obj)
+
+toString()
+```
+
+Rules:
+
+Students are equal if IDs are equal.
+
+Example:
+
+```java
+Student s1 = new Student(1001,...);
+Student s2 = new Student(1001,...);
+
+s1.equals(s2); // true
+```
+
+Custom hash:
+
+```java
+return id % 97;
+```
+
+Do NOT use:
+
+```java
+Objects.hash()
+```
+
+---
+
+## Part 2 – Student Loader Thread
+
+Create:
+
+```java
+StudentLoader extends Thread
+```
+
+Each thread receives part of file lines.
+
+Example:
+
+Thread 1:
+
+```txt
+1001
+1002
+```
+
+Thread 2:
+
+```txt
+1003
+1004
+```
+
+Thread 3:
+
+```txt
+1005
+```
+
+Each thread:
+
+1. Reads assigned lines
+2. Creates Student objects
+3. Stores them in its own list
+
+Example:
+
+```java
+Thread1 → listA
+
+Thread2 → listB
+
+Thread3 → listC
+```
+
+No shared list.
+
+Do NOT use:
+
+```java
+synchronized
+Lock
+Semaphore
+ExecutorService
+```
+
+---
+
+# Part 3 – Merge Results
+
+After threads finish:
+
+```java
+thread1.join();
+thread2.join();
+thread3.join();
+```
+
+Combine results:
+
+```java
+finalList.addAll(listA);
+
+finalList.addAll(listB);
+
+finalList.addAll(listC);
+```
+
+---
+
+## Required Menu
+
+```txt
+1.Load students
+2.Search student
+3.Remove student
+4.Print students
+5.Exit
+```
+
+Search example:
+
+```txt
+ID:1002
+
+Found:
+
+Student{id=1002,name=Sara}
+```
+
+---
+
+## Restrictions
+
+Forbidden:
+
+```java
+HashMap
+HashSet
+TreeMap
+ConcurrentHashMap
+
+synchronized
+wait()
+notify()
+
+Lock
+Semaphore
+
+ExecutorService
+```
+
+Allowed:
+
+```java
+Thread
+join()
+
+ArrayList
+
+FileReader
+BufferedReader
+```