Create relationship.md

Creating relationship info page for DS

src/_patterns/ask-users-for/relationship.md

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+---
+layout: pattern
+permalink: /patterns/ask-users-for/relationship
+sub-section: ask-users-for
+title: Relationship to Veteran
+intro-text: "Follow this pattern to ask a user for their relationship to the Veteran."
+status: use-deployed
+anchors:
+  - anchor: Usage
+  - anchor: Examples
+  - anchor: How to design and build
+  - anchor: Content considerations
+---
+
+## Usage
+
+### When to use this pattern
+
+* **Asking for the relationship to the Veteran.** For example, when a caregiver is filling out a form.
+
+## Examples
+
+### Caregiver Form 10-10CG
+
+{% include component-example.html alt="An example of a single address form." file="/images/patterns/ask-users-for/addresses/single-address.png" caption="Example of a form collecting a single address." width="50%" %}
+
+### Burial benefits Form 21P-530
+
+{% include component-example.html alt="An example of a mailing address form." file="/images/patterns/ask-users-for/addresses/mailing-address.png" caption="Example of a form collecting a mailing address." width="50%" %}
+
+## How to design and build 
+
+### How this pattern works
+
+- **Use either a drop down or radio buttons.** Options should include spouse, child, parent, executor/administraitor of estate or other.
+- **Provide a way to give a ‘None of the above’ answer.** A radio button labeled “Other” should be provided.
+
+
+### Error message templates for addresses
+
+**When a user doesn’t select a relationship:**
+
+Say 'Please select your relationship to the Veteran'