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Handbook.md

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+# <span style="color: #6decff;">mxPIC Quick-Reference Style Guide</span>
+
+
+<div style="background-color: #3f80c0; border: 1px solid #f8f8f8; padding: 15px; border-radius: 15px;">
+    <strong>mxPIC Quick-Reference Style Guide</strong>
+</div>
+
+Welcome to the collaboration of the repository of **mxPIC** program. This repository is aimed for a self-designed PDK that based on ***nazca***, ***gdstk*** and other libraries for the functional build up of photonic integrated circuits (PIC).
+
+This is the fast-track guide to contributing to **mxPIC**. Adherence to these rules is mandatory to pass the automated CI/CD pipeline.
+
+### <span style="color: #ff57c7;">1. Primitives</span>
+
+#### <span style="color: #57dbff;">1.1 edge_couplers</span>
+##### <span style="color: #57dbff;">1.1.1 EC_px3</span>
+Three segement dual-layer etching edge coupler. Previously designed for silicon nitrides.  
+<img src="./images/test.png" width="500">
+
+
+ |Attribute| description |type | default value |
+|---|---|---|---|
+
+