docs: Row model docs (#5276)

* start

* basic row model docs

Author: KevinVandy

docs/guide/column-defs.md

@@ -6,7 +6,7 @@ title: Columns
 
 [Table API](../api/core/table)
 
-## Guide
+## Column Definitions Guide
 
 Column defs are the single most important part of building a table. They are responsible for:
 

docs/guide/row-models.md

@@ -1,3 +1,59 @@
 ---
 title: Row Models
----
+---
+
+## Row Models Guide
+
+If you take a look at the most basic example of TanStack Table, you'll see a code snippet like this:
+
+```ts
+import { getCoreRowModel, useReactTable } from '@tanstack/react-table'
+
+function Component() {
+  const table = useReactTable({
+    data,
+    columns,
+    getCoreRowModel: getCoreRowModel(), //row model
+  })
+}
+```
+
+What is this `getCoreRowModel` function? And why do you have to import it from TanStack Table only to just pass it back to itself?
+
+Well the answer is that TanStack Table is a modular library. Not all code for every single feature is included in the createTable functions/hooks by default. You only need to import and include the code that you will need to correctly generate rows based on the features you want to use.
+
+### Import Row Models
+
+You should only import the row models that you need. Here are all of the row models that are available:
+
+```ts
+import {
+  getCoreRowModel,
+  getExpandedRowModel,
+  getFacetedMinMaxValues,
+  getFacetedRowModel,
+  getFacetedUniqueValues,
+  getFilteredRowModel,
+  getGroupedRowModel,
+  getPaginationRowModel,
+  getSortedRowModel,
+}
+//...
+const table = useReactTable({
+  data,
+  columns,
+  getCoreRowModel: getCoreRowModel(),
+  getExpandedRowModel: getExpandedRowModel(),
+  getFacetedMinMaxValues: getFacetedMinMaxValues(),
+  getFacetedRowModel: getFacetedRowModel(),
+  getFacetedUniqueValues: getFacetedUniqueValues(),
+  getFilteredRowModel: getFilteredRowModel(),
+  getGroupedRowModel: getGroupedRowModel(),
+  getPaginationRowModel: getPaginationRowModel(),
+  getSortedRowModel: getSortedRowModel(),
+})
+```
+
+### Customize/Fork Row Models
+
+You don't have to use the exact row models that are provided by TanStack Table. If you need some advanced customization for certain row models, feel free to copy the [source code](https://github.com/TanStack/table/tree/main/packages/table-core/src/utils) for the row model you want to customize and modify it to your needs.