(docs): Creating a page for `How To Set Default Value on Entity Field…

…s` in the How To section.

docs/how-to/default-value-entity-field.md

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+---
+title: How To Set Default Value on Entity Fields
+sidebar_label: Set Default Value for an Entity Field
+slug: /how-to/set-default-value-entity-field
+---
+
+# How To Set Default Value on Entity Fields
+
+Setting default values for your entity fields in Amplication is straightforward using the `@default()` custom Prisma attribute.
+This can be helpful in scenarios where you want certain fields to have a predefined value when new records are created.
+
+This guide will walk you through the steps to achieve this with various examples.
+
+![Default Custom Prisma Attribute](./assets/default-custom-attribute.png)
+
+## Steps to Set a Default Value:
+
+1. Navigate to your service's _Entity Overview_ page.
+2. Click on the specific _Entity_ field you want to set a default value for.
+3. On the Entity Field page, you will find a text box labeled **Custom Attributes**. Here, you'll enter the custom prisma @default() attribute.
+4. In the Custom Attribute text field, enter the `@default()` attribute followed by the desired default value in parentheses. 
+5. After entering the default value, it will be saved automatically.
+
+## Examples
+
+For example, to set a default string value of "DefaultText", you would enter:
+
+```
+@default("DefaultText")
+```
+
+For numeric fields, simply enter the number without quotes:
+
+```
+@default(5)
+```
+
+:::tip
+Refer to [Prisma's documentation](https://www.prisma.io/docs/reference/api-reference/prisma-schema-reference#default) for a full list of the values that Prisma gives you access to for the `@default()` custom attribute.
+:::

sidebars.js

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         "how-to/import-prisma-schema",
         "getting-started/how-prisma-schema-is-converted-into-entities",
         "how-to/erd-view-for-amplication-entities",