Add docs

src/components/ItemTableCell/ItemTableCell.md

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+The ItemTableCell wraps an [MUI TableCell](https://material-ui.com/api/table-cell/) and adds styling. 
+
+## Default Usage
+```jsx
+import { Paper } from '@material-ui/core';
+import ItemTableCell from "./ItemTableCell";
+
+<Paper>
+	<ItemTableCell>
+		Hello, moto!
+	</ItemTableCell>
+</Paper>
+```
+
+```jsx static
+<Paper>
+	<ItemTableCell>
+		Hello, moto!
+	</ItemTableCell>
+</Paper>
+```
+
+## Forwarded TableCell Props
+Props can be passed to the TableCell component using the TableCellProps prop.
+```jsx
+import { Paper } from '@material-ui/core';
+import ItemTableCell from "./ItemTableCell";
+
+<ItemTableCell TableCellProps={{ component: Paper, variant: "footer" }}>
+	Hello, moto!
+</ItemTableCell>
+```
+
+```jsx static
+<ItemTableCell TableCellProps={{ component: Paper, variant: "footer" }}>
+	Hello, moto!
+</ItemTableCell>
+```