Update README.md

Author: ehsanwwe

README.md

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+<div style="display:flex;justify-content:space_between">
 <img src="https://github.com/ehsanwwe/Unity-SoftBody-physics/blob/main/softbody3.gif?raw=true" height="300" alt="unity softbody">
 <img src="https://github.com/ehsanwwe/Unity-SoftBody-physics/blob/main/softbody2.gif?raw=true" height="300" alt="unity softbody">
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+</div>
 <br>
 <h2>how to use</h2>
 Add <b>SoftBodyGenerator.cs</b> script to your object