add changelog and release metadata

.ldrelease/config.yml

@@ -0,0 +1,8 @@
+template:
+  name: go
+  env:
+    LD_RELEASE_GO_IMPORT_PATH: github.com/launchdarkly/go-ntlm-proxy-auth
+
+publications:
+  - url: https://godoc.org/github.com/launchdarkly/go-ntlm-proxy-auth
+    description: documentation

CHANGELOG.md

@@ -0,0 +1,6 @@
+# Change log
+
+All notable changes to the project will be documented in this file. This project adheres to [Semantic Versioning](http://semver.org).
+
+## [1.0.0] - 2019-07-16
+Initial release of this fork. The only change from the upstream code is that its dependency on `github.com/Azure/go-ntlmssp` has been replaced with `github.com/launchdarkly/go-ntlmssp`(https://github.com/launchdarkly/go-ntlmssp).