Basic readme.

README.md

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+# cq usage
+
+```sh
+cq < file.cbor
+cq [attribute] < file.cbor
+```
+
+Example:
+
+```sh
+cq ".people.alice.age" < file.cbor
+```
+
+# json-to-cbor usage
+
+```sh
+json-to-cbor < file.json > file.cbor
+```
+