diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..01109d4
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2023 museum-digital
+
+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 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.
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..1454a05
--- /dev/null
+++ b/README.md
@@ -0,0 +1,13 @@
+# Standard functions for museum-digital
+
+This repository contains the most basic functions for working on museum-digital. Functions are provided as static functions of classes.
+The (by far) most relevant classes in this repository are:
+
+- [MD_STD](./src/MD_STD.php)
+  This class mainly provides type-safe wrappers around internal PHP functions. Where the general [`realpath()`](https://www.php.net/manual/en/function.realpath.php) will return `false` if the provided path does not exist, `MD_STD::realpath()` will, e.g., throw an exception or return the absolute path of the input file.
+- [MD_STD_IN](./src/MD_STD_IN.php)
+  This class is concerned with safely getting input data. It thus mainly covers shorthand functions for validating or sanitizing various types of input data.
+
+## License
+
+This project is licensed under the MIT License. See the [LICENSE](./LICENSE) file for the full license text.