added a readme

lab3/README.md

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+# Scheduler Simulation
+
+This project simulates how a scheduler runs processes on a processor with one CPU and two CPUs. The scheduler can be executed for single-core and multi-core setups.
+
+## File Structure
+
+```
+├── src/                # Source files
+│   ├── scheduler.cpp
+│   ├── multi_core_scheduler.cpp
+├── bin/                # Executables (generated after build)
+├── doc/                # Assignment documentation
+└── WorkloadFiles/      # Workload files
+```
+
+
+## Compilation and Execution
+
+To build and run the simulations, use the following commands:
+
+### Single-Core Scheduler
+1. **Build the single-core scheduler**:
+    ```bash
+    make build-sched
+    ```
+2. **Run the single-core scheduler**:
+    ```bash
+    make run-sched WF=<workload_file> SA=<scheduling_algorithm>
+    ```
+
+### Multi-Core Scheduler
+1. **Build the multi-core scheduler**:
+    ```bash
+    make build-sched-multi
+    ```
+2. **Run the multi-core scheduler**:
+    ```bash
+    make run-sched-multi WF=<workload_file> SA=<scheduling_algorithm>
+    ```
+
+### Clean
+To remove the compiled binaries:
+```bash
+make clean