docs: add project description and server setup instructions to README

esp/microcoapy/coap_option.py

@@ -0,0 +1,10 @@
+class CoapOption:
+    def __init__(self, number=-1, buffer=None):
+        self.number = number
+        byteBuf = bytearray()
+        if buffer is not None:
+            if isinstance(buffer, str):
+                byteBuf.extend(buffer.encode("utf-8"))
+            else:
+                byteBuf.extend(buffer)
+        self.buffer = byteBuf