Update index.md

update the description

Author: edobrowolska

OSC/index.md

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 The [Open Science Catalog (OSC)](https://opensciencedata.esa.int/) is a key component of the ESA EO Open Science framework. It is a publicly available web-based application designed to provide easy access to scientific resources including geoscience products, workflows, experiments and documentation from activities and projects funded by ESA under the EO Programme. 
 
 
-There are three ways to add information to the OSC:
+There are few modalities on how to make a contribution. Choose a way that best fits your familiarity and technical backround to contribute to Open Science Catalog:
 
-### 1: Using a Visual GUI
+### 1: Use a Visual GUI Interface (No coding required) 
 
 - [Git Clerk](./git_clerk_example.md) - A guide for using the Git Clerk tool which is a user interface for automatically creating product entries and creating a Pull Request in the OSC GitHub Repo.
 
-### 2: Manually opening a PR
-- [Directly editing the json files](./osc_pr_manual.ipynb) - A guide for manually creating Product entries. Requires knowledge of git.
+### 2: Manually contribution (For users familiar with Git)
+- [Direct editing metadata in JSON](./osc_pr_manual.ipynb) - A guide for manually creating Open Science Catalog entries by creating JSON files with metadata. 
 
-- [Generating OSC files using pystac](./osc_pr_pystac.ipynb) - A guide for creating Product entries using pystac. Requires knowledge of git and Python.
+- [Generating OSC files with pystac](./osc_pr_pystac.ipynb) - A guide for creating Open Science Catalog entries in more automated way by implementing `pystac`. Require familiarity with Python. 
 
-### 3: Using one of the platform tools
+### 3: Using one of the platform tools (For EarthCODE integrated platforms users)
 - [DeepCode](https://github.com/deepesdl/deep-code) - An example using DeepCode: a library for automatically generating product entries for DeepESDL datasets.