docs: add changelog for v0.1.0-alpha

Author: ammarheidari

CHANGELOG.md

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+# Changelog
+
+All notable changes to SIGTRAN.NET will be documented in this file.
+
+This project follows Semantic Versioning once the public API reaches a stable release. During the alpha phase, breaking API changes may still occur as protocol behavior, transport abstractions, and interoperability evidence are finalized.
+
+## [0.1.0-alpha] - 2026-06-27
+
+### Release type
+
+First public alpha / preview release preparation.
+
+### Summary
+
+SIGTRAN.NET is introduced as the first open-source .NET 10 SDK dedicated to SIGTRAN and SS7-over-IP protocol engineering.
+
+This alpha milestone is intended for early contributors, protocol review, lab validation, and community feedback. It is not yet a production-ready telecom signaling stack.
+
+### Current focus
+
+- M3UA as the first production-oriented protocol milestone.
+- Transport abstraction for SIGTRAN workloads.
+- SCTP direction with Linux native SCTP as the intended production path.
+- SCCP, TCAP, and MAP foundations for future standards-oriented layers.
+- Byte-level protocol testing and protocol validation.
+- Wireshark-friendly diagnostics and trace-oriented tooling.
+- Release governance, package metadata, and documentation readiness.
+
+### Contributor areas
+
+Community contributions are especially welcome in the following areas:
+
+- M3UA protocol review and validation.
+- SCTP transport testing on Linux.
+- SCCP, TCAP, and MAP standards alignment.
+- ASN.1 BER validation and telecom protocol conformance.
+- Wireshark trace comparison and interoperability testing.
+- Documentation, examples, and developer experience.
+- High-performance C# review and memory-allocation improvements.
+
+### Production-readiness notice
+
+This is an alpha release track. Production usage should wait for retained interoperability evidence, Linux SCTP verification, external peer validation, and stable release governance.
+
+[0.1.0-alpha]: https://github.com/araditc/sigtran.net/releases/tag/v0.1.0-alpha