Added README.md

README.md

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+# DataFixerUpper
+A set of utilities designed for incremental building, merging and optimization of data transformations. Created for converting the game data for Minecraft: Java Edition between different versions of the game.
+
+## Gradle
+First include our repository:
+```groovy
+maven {
+    url "https://libraries.minecraft.net"
+}
+```
+
+And then use this library (change `(the latest version)` to the latest version!):
+```groovy
+compile 'com.mojang:datafixerupper:(the latest version)'
+```
+
+## Maven
+First include our repository:
+```xml
+<repository>
+  <id>minecraft-libraries</id>
+  <name>Minecraft Libraries</name>
+  <url>https://libraries.minecraft.net</url>
+</repository>
+```
+
+And then use this library (change `(the latest version)` to the latest version!):
+```xml
+<dependency>
+    <groupId>com.mojang</groupId>
+    <artifactId>datafixerupper</artifactId>
+    <version>(the latest version)</version>
+</dependency>
+```
+
+# Usage
+Core data types are Schema and DataFix: Schema is a set of type definitions specifying what data types the system is interested in and how they relate to each other, DataFix is is a rewrite rule between types (see [references](#references) below). DataFixerBuilder takes a list of schemas and fixes converting between those schemas, and creates an optimized converter between the types describes in those schemas. DSL is a class with building blocks used to create schemas and fixes.
+
+# Contributing
+Contributions are suspended until we have a process in place to handle them.
+
+Most contributions will require you to agree to a Contributor License Agreement (CLA) declaring that you have the right to,
+and actually do, grant us the rights to use your contribution. For details, visit https://cla.microsoft.com.
+
+This project has adopted the [Microsoft Open Source Code of Conduct](https://opensource.microsoft.com/codeofconduct/).
+For more information see the [Code of Conduct FAQ](https://opensource.microsoft.com/codeofconduct/faq/) or
+contact [[email protected]](mailto:[email protected]) with any additional questions or comments.
+
+# References
+## Optimizing functions
+  Cunha, A., & Pinto, J. S. (2005). Point-free program transformation
+  Lämmel, R., Visser, E., & Visser, J. (2002). The essence of strategic programming
+
+## How to handle recursive types
+  Cunha, A., & Pacheco, H. (2011). Algebraic specialization of generic functions for recursive types
+  Yakushev, A. R., Holdermans, S., Löh, A., & Jeuring, J. (2009, August). Generic programming with fixed points for mutually recursive datatypes
+  Magalhães, J. P., & Löh, A. (2012). A formal comparison of approaches to datatype-generic programming
+
+## Optics
+  Pickering, M., Gibbons, J., & Wu, N. (2017). Profunctor Optics: Modular Data Accessors
+  Pacheco, H., & Cunha, A. (2010, June). Generic point-free lenses
+
+## Tying it together
+  Cunha, A., Oliveira, J. N., & Visser, J. (2006, August). Type-safe two-level data transformation
+  Cunha, A., & Visser, J. (2011). Transformation of structure-shy programs with application to XPath queries and strategic functions
+  Pacheco, H., & Cunha, A. (2011, January). Calculating with lenses: optimising bidirectional transformations