Add readme files for the EMF language modules.

jplag.frontend.emf-metamodel-dynamic/README.md

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+# Dynamic EMF metamodel language frontend
+The dynamic EMF metamodel language frontend allows the use of JPlag with metamodel submissions.
+It is based on the EMF API.
+
+### EMF specification compatibility
+This frontend is based on the EMF dependencies available on maven central. These might not be the newest versions of EMF. For details, the [JPlag aggregator pom](https://github.com/jplag/JPlag/blob/263e85e544152cc8b0caa3399127debb7a458746/pom.xml#L84-L86).
+
+### Token Extraction
+For the token extraction, we visit the containment tree of the metamodel and extract tokens for certain metamodel elements based on their metaclass. In this module, we extract tokens based on a [handcrafted token set](https://github.com/jplag/JPlag/blob/263e85e544152cc8b0caa3399127debb7a458746/jplag.frontend.emf-metamodel/src/main/java/de/jplag/emf/MetamodelTokenConstants.java). Note that not for all concrete metaclasses tokens are extracted. `EFactory`, `EGenericType`, and `EObject` are ignored. Moreover, for some metaclasses, multiple token types are extracted. Finally, some references are also used for token extraction.
+ 
+
+### Usage
+To use this frontend, add the `-l emf-metamodel` flag in the CLI, or use a `JPlagOption` object set to `LanguageOption.EMF` in the Java API as described in the usage information in the [readme of the main project](https://github.com/jplag/JPlag#usage) and [in the wiki](https://github.com/jplag/JPlag/wiki/1.-How-to-Use-JPlag).
+
+### More Info
+More information can be found in the paper *"Token-based Plagiarism Detection for Metamodels"* (MODELS-C 2022, accepted for publication, link coming soon). 

jplag.frontend.emf-metamodel/README.md

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+# EMF metamodel language frontend
+The EMF metamodel language frontend allows the use of JPlag with metamodel submissions.
+It is based on the EMF API.
+
+### EMF specification compatibility
+This frontend is based on the EMF dependencies available on maven central. These might not be the newest versions of EMF. For details, the [JPlag aggregator pom](https://github.com/jplag/JPlag/blob/263e85e544152cc8b0caa3399127debb7a458746/pom.xml#L84-L86).
+
+### Token Extraction
+For the token extraction, we visit the containment tree of the metamodel and extract tokens for all metamodel elements based on their concrete metaclass. In this module, we thus extract tokens based on a [dynamic token set](https://github.com/jplag/JPlag/blob/263e85e544152cc8b0caa3399127debb7a458746/jplag.frontend.emf-metamodel-dynamic/src/main/java/de/jplag/emf/dynamic/DynamicMetamodelTokenConstants.java).
+
+### Usage
+To use this frontend, add the `-l emf-metamodel-dynamic` flag in the CLI, or use a `JPlagOption` object set to `LanguageOption.EMF_DYNAMIC` in the Java API as described in the usage information in the [readme of the main project](https://github.com/jplag/JPlag#usage) and [in the wiki](https://github.com/jplag/JPlag/wiki/1.-How-to-Use-JPlag).
+
+### More Info
+More information can be found in the paper *"Token-based Plagiarism Detection for Metamodels"* (MODELS-C 2022, accepted for publication, link coming soon).