Update Readme document with predefined inference rules of classical logic

README.md

@@ -29,6 +29,7 @@ By default, the development server will run on http://localhost:8080. You can op
 ## User Guide
 
 ## Notation
+
  The following notation was used in our proof assistant. 
 
  | **Symbol** | **Representation** | **Meaning** |
@@ -43,6 +44,14 @@ By default, the development server will run on http://localhost:8080. You can op
 | False      | `false`            | Represents a false statement. |
 | Symbol     | A single uppercase or lowercase letter | Represents a variable or a constant in logical expressions. |
 
+## Inference Rules
+
+Our proof assistant incorporates predefined inference rules of classical logic in Sequent Natural Deduction. 
+
+The following rules were included in our proof assistant:
+<img src="./src/assets/rules1.png" alt="rules1" title="rules1" width="300"/>
+<img src="./src/assets/rules2.png" alt="rules2" title="rules2" width="300"/>
+
 ## Flowchart
 **Step 1:** Type a sequent you want to prove in the input line, and click submit.
 
@@ -53,3 +62,4 @@ By default, the development server will run on http://localhost:8080. You can op
 **Step 4:** If you are correct, the dialog will disappear, and you could repeat steps 2-3 until you finish your proof.
 
 <img src="./src/assets/userFlowChart.png" alt="User Flowchart" title="User Flowchart" width="300"/>
+