Preparing release v0.1.0

So that we can evaluate the library safely pre-1.0 rather than pinning
to master.
diff --git a/CHANGELOG.md b/CHANGELOG.md
new file mode 100644
index 0000000..8b8aca2
--- /dev/null
+++ b/CHANGELOG.md
@@ -0,0 +1,7 @@
+Releases
+========
+
+v0.1.0 (2017-31-03)
+===================
+
+-   Initial release