Create mantra.md

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+In this guide, you'll learn how to initialize a MANTRA-based Substreams project. You’ll learn how to set up a simple project to extract raw data or filter events from a smart contract.
+
+## Prerequisites
+
+- Docker and VS Code installed and up-to-date.
+- Visit the [Getting Started Guide](https://github.com/streamingfast/substreams-starter) to initialize your Dev Container.
+
+## Step 1: Initialize Your MANTRA Substreams Project
+
+1. Open your Dev Container and run the following command to initialize your project:
+
+    ```bash
+    substreams init
+    ```
+
+2. You will be given the option to choose between two MANTRA project options. Select the one that best fits your requirements:
+    - **MANTRA-minimal**: Creates a simple Substreams that extracts raw data from the block and generates Rust code.
+    - **MANTRA-events**: Creates a Substreams that extracts MANTRA events using the cached [MANTRA Foundational Module](https://substreams.dev/packages/mantra-common/v0.1.0), filtered by one or more smart contract addresses.
+
+
+## Step 2: Visualize the Data
+
+1. Create your account [here](https://thegraph.market/) to generate an authentification token (JWT) and pass it as input to: 
+
+    ```bash
+    substreams auth
+    ```
+
+2. Run the following command to visualize and itterate on your filtered data model:
+
+    ```bash
+    substreams gui
+    ````
+
+## Step 3: Customize your Project 
+
+After initialization, you can:
+
+- Modify your Substreams manifest to include additional filters or configurations.
+- Implement custom processing logic in Rust based on the filtered data retrieved by the foundational module.
+
+## Additional Resources
+
+You may find these additional resources helpful for developing your first EVM application.
+
+### Dev Container Reference
+
+The [Dev Container Reference](../../references/devcontainer-ref.md) helps you navigate the complete container and its common errors. 
+
+### GUI Reference
+
+The [GUI reference](../../references/gui.md) lets you explore all the tools available in the Substreams GUI.
+
+### Manifests Reference
+
+The [Manifests Reference](../../references/manifests.md) helps you with editing the `substreams.yaml`.