Update README.md

README.md

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 ![](../../workflows/gds/badge.svg) ![](../../workflows/docs/badge.svg) ![](../../workflows/test/badge.svg)
 
+## How It Works?
+
+The Tiny Tapeout Playground operates by applying an input current injection to the IF neuron using switches. The IF neuron model fires a spike when the input voltage crosses the specified threshold without considering any leakage. 
+If the membrane potential exceeds the threshold, it triggers a spike.
+
+
 ## Simulations and Diagram
 
 ![Simulation Output](figures/kill_the_current.png)