Add documentation

modules/ppcp-settings/docs/glossary.md

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+# Glossary
+
+This document provides definitions and explanations of key terms used in the plugin.
+
+---
+
+## Eligibility
+
+**Eligibility** determines whether a merchant can access a specific feature within the plugin. It is a boolean value (`true` or `false`) that depends on certain criteria, such as:
+
+- **Country**: The merchant's location or the country where their business operates.
+- **Other Factors**: Additional conditions, such as subscription plans, business type, or compliance requirements.
+
+If a merchant is **eligible** (`true`) for a feature, the feature will be visible and accessible in the plugin. If they are **not eligible** (`false`), the feature will be hidden or unavailable.
+
+---
+
+## Capability
+
+**Capability** refers to the activation status of a feature for an eligible merchant. Even if a merchant is eligible for a feature, they may need to activate it in their PayPal dashboard to use it. Capability has two states:
+
+- **Active**: The feature is enabled, and the merchant can configure and use it.
+- **Inactive**: The feature is not enabled, and the merchant will be guided on how to activate it (e.g., through instructions or prompts).
+
+Capability ensures that eligible merchants have control over which features they want to use and configure within the plugin.
+
+---
+
+### Example Workflow
+
+1. A merchant is **eligible** for a feature based on their country and other factors.
+2. If the feature is **active** (capability is enabled), the merchant can configure and use it.
+3. If the feature is **inactive**, the plugin will provide instructions on how to activate it.
+
+---