🎨 Readme Message updated

Author: FeldmeierMichael

README.md

@@ -34,7 +34,11 @@ To use this plugin with ABC:
 4. **Run ABC** and use the `pexact` command:
    ```bash
    ./abc
-   abc 01> pexact
+   abc 01> pexact -h
+   abc 01> usage: pexact [-I <num>] [-M <num>] <hex>
+                   exact synthesis of multi-input function using two-input gates
+        -I <num> : the number of input variables [default = 0]
+        -M <num> : search space exploration mode 0: queue search; 1: free search; 2: binary search [default = 0]
    ```
 
 ## 🛠️ Getting Started (Developers)