docs(onboarding) - add docs about basic information (#807)

* add schema changes

* finish docs

* remove line

Author: gabrielseco

docs/schema-changes/SCHEMA_CHANGES.md

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+# Schema Changes
+
+## Overview
+
+This documentation tracks JSON schema version changes across the Remote Flows SDK. Use this guide to understand what changed between versions and which SDK version supports each schema.
+
+**For new integrations:** Always use the latest version for each flow unless you have specific legacy requirements.
+
+## Basic Information (EOR)
+
+Schema versions for the Basic Information step in employee onboarding flows.
+
+- **Latest: [v3](./eor/basic-information/v3/v3.md)** (SDK 1.23.0+) - **Recommended for all new integrations**
+  - Removes unused manager/department fields
+  - Adds Argentina acknowledgement field
+  - Better seniority field coverage (KOR, BRA, JPN)
+- [v1](./basic-information/v1.md) (SDK 1.0.0+) - Legacy version, maintained for backward compatibility
+
+**Quick Start (v3):**
+
+```tsx
+<OnboardingFlow
+  options={{
+    jsonSchemaVersion: {
+      employment_basic_information: 3,
+    },
+  }}
+/>
+```
+
+## Contract Details (EOR)
+
+_Coming soon_
+
+## Version Support Matrix
+
+Track which schema versions are supported by each SDK version.
+| SDK Version | Basic Information | Contract Details |
+|-------------|-------------------|------------------|
+| 1.23.0+ | v3 (recommended) | _TBD_ |
+| 1.0.0+ | v1 (legacy) | _TBD_ |
+
+**Legend:**
+
+- **Recommended** - Use this version for new integrations
+- **Legacy** - Maintained for backward compatibility only
+- **TBD** - Coming soon

docs/schema-changes/eor/basic-information/v1.md

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+# Basic Information v1
+
+> ⚠️ **Legacy Version**: This schema is maintained for backward compatibility only.
+> New integrations should use [v3](./v3.md).
+
+**Available in:** SDK 1.0.0
+
+## Overview
+
+Schema v1 for all countries provide fields like manager and department.

docs/schema-changes/eor/basic-information/v3/v3-changes.pdf

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+# Basic Information v3
+
+**Available in:** SDK 1.23.0
+
+## Overview
+
+Schema v3 is the **recommended** version from **2026-03-26**, you can use it for all countries.
+
+At the current date, **2026-03-26**, the SDK will load by default v1, you only need to pass the correct version.
+
+## Key Changes
+
+- Manager and department field were deleted, currently no partners use these fields, if you have css to hide it, remember do delete it
+- Argentina ackowledge field
+- Seniority fields coverage in some countries like KOR, BRA, JAPAN, we know tell if a field is supported or not
+
+## Visual Comparison
+
+📄 **[View detailed comparison with screenshots →](./v3-changes.pdf)**
+
+## Caveats
+
+This schema affects to Germany and France but the SDK doesn't support it at the moment this docs are written.
+
+We'll provide docs about these two countries in the future.
+
+## Migration
+
+```tsx
+// Before
+<OnboardingFlow {...onboardingProps} />;
+
+// After
+<OnboardingFlow
+  options={{
+    jsonSchemaVersion: {
+      employment_basic_information: 3,
+    },
+  }}
+/>;
+```