docs: add LICENSE and README

LICENSE

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+Copyright 2022 Benedikt Fein <[email protected]>
+
+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.

README.adoc

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+= README
+
+:url-artemis: https://www.github.com/ls1intum/artemis
+
+Provides the Docker image that is used in link:{url-artemis}[Artemis] to run the automatic tests for Haskell exercises.
+
+
+== Updating
+
+When updating the Stack resolver version, a new tag named `vMAJOR.MINOR.0` has to be published.
+
+In Artemis, the Docker image reference has to be changed in `src/main/resources/config/application.yml`.
+The Stack version has to be updated in a few places:
+
+* `src/main/resources/templates/haskell/exercise/stack.yaml`
+* `src/main/resources/templates/haskell/solution/stack.yaml`
+* `src/main/resources/templates/haskell/test/stack.yaml`