Update README.md

Author: sivrmn

README.md

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-# Step Detection Algorithm (SDA)
-A toolbox for detecting steps of unknown size and location in a noisy signal.
+<p float="center">
+  <img src="Figures/Logo/SDA_Crop.svg" title = "Step Detection Algorithm" width = "1000"  />
+</p>
+
+**Step Detection Algorithm (SDA):** A toolbox for detecting steps of unknown size and location in a noisy signal.
 
 # How to use
 Here is a sample code to get the estimate of step signals from noisy measurements.