chore: dev docs

docs/journeys/developer-resources.md

@@ -0,0 +1,16 @@
+# Developing for epilot Journeys (BETA)
+epilot journeys are now extendable with custom apps/blocks which can be developed by third-party developers. This guide will help you to get started with developing for epilot journeys.
+
+## Prerequisites
+
+- Basic knowledge of HTML, CSS, and JavaScript
+
+## Getting Started
+To get to know how to build a custom block for journeys. Check the docs here: [Custom Block Examples](https://github.com/epilot-dev/epilot-journey-sdk/blob/main/custom-block.md)
+
+## Useful resources
+### Journey UI Library (React)
+- [Source Code](https://github.com/epilot-dev/concorde-elements)
+- [Storybook](https://66437b5b4b88b4448919780e-jfmblwtofq.chromatic.com/)
+
+