Add change log and license file.

The license is declared as MIT by the original author in the OPAM file
(commit 9697a4e).  Adding the file avoids errors from dune-release.

CHANGES.md

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+## 1.2.0 - 2024-11-28
+
+  - Added `Stmt.start_txn` (#59 by Corentin Leruth).
+  - Added `Res.insert_id` as binding for `mysql_stmt_insert_id` (#58 by
+    Corentin Leruth).
+  - Updated to support recent OCaml versions (#45 by @kit-ty-kate).
+  - Fixed too-early retrieval of statement metadata (#41 by Albert Peschar).
+  - Fixed decoding bug for the integer type (#54 by Raman Varabets, tested
+    by #61 by Corentin Leruth).
+  - Fixed a memory leaks related to result metadata (#39 by Albert Peschar).
+  - The build system is now dune and dune-configurator (#52 by Petter A.
+    Urkedal) and some of the examples have been converted to a test suite
+    (#60 by Petter A. Urkedal).
+  - The project has been transferred to ocaml-community with Petter A.
+    Urkedal as the new maintainer.

LICENSE

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+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to
+deal in the Software without restriction, including without limitation the
+rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+sell copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice (including the next
+paragraph) shall be included in all copies or substantial portions of the
+Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+IN THE SOFTWARE.