add changelog file

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+## v0.1.0 -- 2024-06-24
+
+Initial release of `as2org-rs`.
+
+### Highlights
+
+* automatically retrieve the most up-to-date CAIDA as-to-organization data
+* `.get_as_info(ASN)` to retrieve information about an AS
+* `.get_siblings(ASN)` to retrieve all siblings of an AS
+* `.are_siblings(ASN1, ASN2)` to check if two ASes are siblings
+
+The main returning data structure is `As2orgAsInfo`, which contains the following fields:
+
+* `asn`: the AS number
+* `name`: the name provide for the individual AS number
+* `country_code`: the country code of the organization's registration country
+* `org_id`: maps to an organization entry
+* `org_name`: the name of the organization
+* `source`: the RIR or NIR database which was contained this entry