Update README.md

README.md

@@ -37,6 +37,8 @@ Feel free to initiate a [discussion](https://github.com/cimug-org/CIMTool-Builde
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 | [json-schema-draft-07-jsonschema2pojo.xsl](custom-builders/json-schema-draft-07-jsonschema2pojo/builder.md) | Specialized JSON schema |  The **json-schema-draft-07-jsonschema2pojo.xsl** builder produces a specialized JSON schema to be used as input into the jsonschema2pojo open source Maven or Gradle build plugins to generate annotated Java classes for data-binding with Jackson 2.x or Gson. This custom builder was derived from the **json-schema-draft-07.xsl** builder and is intended to serve as a companion builder to it. |
 | [json-schema-draft-2020-12-jsonschema2pojo.xsl](custom-builders/json-schema-draft-2020-12-jsonschema2pojo/builder.md) | Specialized JSON schema | The **json-schema-draft-2020-12-jsonschema2pojo.xsl** builder produces a specialized JSON schema to be used as input into the jsonschema2pojo open source Maven or Gradle build plugins to generate annotated Java classes for data-binding with Jackson 2.x or Gson. This custom builder was derived from the **json-schema-draft-2020-12.xsl** builder and is intended to serve as a companion builder to it. |
+| [cimantic-graphs.xsl](custom-builders/cimantic-graphs/builder.md)| Python Source Code | The **cimantic-graphs.xsl** builder produces a specialized python dataclass schema to be used as input into the CIMantic Graphs open source library for creating, parsing, and editing CIM power system models using in-memory knowledge graphs. |
+| [cimantic-graphs-init.xsl](custom-builders/cimantic-graphs/builder.md)| Python Source Code | This builder is intended to be used in conjunction the **cimantic-graphs-init.xsl** builder, which generates the `python __init__.py` file required for library imports to work correctly. |
 
 ## Background
 **CIMTool** ships with a variety of different types of builders that generate artifacts based on a profile. Examples of existing builders include those that generate XSD schemas, JPA Java source code, RDBMS DDL scripts, RDFS profiles, and RTF Word docs among others.