add CoC

CODE_OF_CONDUCT.md

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+# Code of Conduct
+
+We are sentient.  
+To be sentient is to be limited.  
+In our limitation, we make choices that are unwise or are flawed.
+
+If we make unwise choices because of our limitation,  
+we cannot judge others for the same reason.
+
+So, we cannot judge,  
+thus we forgive. 
+
+This project and its results are intended as:  
+a place of learning,  
+a place of understanding,  
+a place of teaching,  
+a place of sharing,  
+a place of creators creating the tools for other creators to create complicated things elegantly.
+
+Be well, Creator. Be well and create.
+
+---
+
+Based on the [Creator's Code v2](https://github.com/Xe/creators-code). Please
+read the link for more information.