Docs update

docs/source/adding-language.rst

@@ -1,2 +1,26 @@
 Adding a Programming Language
 =============================
+
+To add compatability for a programming language in *multiplex*, you must create a language specification in ``multiplex/languages/__init__.py``.
+
+The language should be added to the ``_REGISTRY`` as shown below:
+
+.. code-block:: Python
+   _REGISTRY = {
+    "java": LanguageSpec(
+        name="java",
+        extension=".java", # the file extension for Java code files
+        ts_language=Language(ts_java.language()), # the TreeSitter Java library
+        def_node_types=frozenset({"method_declaration", "constructor_declaration"}), # the structures to mutate
+        comment_node_types=frozenset({"comment", "line_comment", "block_comment"}), # comments to ignore
+        fence="java", # the language decription used for code fences
+        noun="Java method", # noun for inserting in prompts
+        label="Java", # internal label
+    ),
+   }
+
+This example shows the Java language description using the TreeSitter library nodes to describe specific code structures such as comments and method definitions to enable *multiplex* to mutate the relevant code.
+
+The user should import the relevant TreeSitter library for the language they are adding.
+Currently, *multiplex* can only support languages supported by TreeSitter.
+

docs/source/index.rst

@@ -54,6 +54,14 @@ If you are specifically interested in Hazard Analysis approaches for guiding LLM
 
    getting-started
    existing-modules
-   configuration
+
+.. toctree::
+   :hidden:
+   :maxdepth: 2
+   :caption: Extending
+
+   adding-language
+   adding-mutant-generation
+   adding-execution-and-evaluation