Add README file.

README.md

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+![GitHub Release](https://img.shields.io/github/v/release/vinicius-smartme/gcc-linaro-action) ![GitHub Actions Workflow Status](https://img.shields.io/github/actions/workflow/status/vinicius-smartme/gcc-linaro-action/.github%2Fworkflows%2Ftest.yml)
+
+
+## What is gcc-linaro?
+
+The [GCC-linaro](https://releases.linaro.org/components/toolchain/gcc-linaro/) is a [GCC](https://gcc.gnu.org/) based toolchain for 
+ARM devices developed by the [Linaro](https://www.linaro.org/).
+
+## What is this action for?
+
+The `gcc-linaro action` goal is to install a GCC-Linaro based toolchain (which includes the cross compiler) on a github 
+workflow. As the installation of cross compilers and toolchains on [GNU/Linux](https://www.gnu.org/gnu/linux-and-gnu.html) OSs is quite easy and strait forward, this 
+action is focused on Windows OS only, which requires more steps for download and installation.
+
+## How to use it?
+
+Add the `gcc-linaro-action` on your github workflow with the desired toolchain.
+
+### Usage example
+
+```yml
+name: Test GCC-Linaro Action
+
+on:
+  push:
+    branches:
+      - '**'
+  pull_request:
+    branches:
+      - '**'
+
+jobs:
+  test:
+    runs-on: windows-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Install the GCC Linaro toolchain
+        uses: vinicius-smartme/gcc-linaro-action@main
+        with:
+          version: '5'
+          toolchain: 'arm-linux-gnueabihf'
+
+      - name: Verify the GCC cross compiler
+        run: |
+          arm-linux-gnueabihf-gcc --version
+
+      - name: Run a sample build command
+        run: |
+          # Creates a hello.c file
+          echo '#include <stdio.h>' > hello.c
+          echo 'int main() {' >> hello.c
+          echo '    printf("Hello, ARM world!\\n");' >> hello.c
+          echo '    return 0;' >> hello.c
+          echo '}' >> hello.c
+          arm-linux-gnueabihf-gcc -o hello hello.c
+```
+
+### Input options (required)
+
+| Option | Value | Description | Default |
+| :--- | :--- | :--- | :--- |
+| **version**  | 4, 5, 6 or 7 | The selected latest release toolchain version | `7` |
+| **toolchain** | `aarch64-elf`, `aarch64-linux-gnu`, `aarch64_be-elf`, `aarch64_be-linux-gnu`, `arm-eabi`, `arm-linux-gnueabi`, `arm-linux-gnueabihf`, `armeb-eabi`, `armeb-linux-gnueabi`, `armeb-linux-gnueabihf` or `armv8l-linux-gnueabihf`| The ARM toolchain | - |
+
+## License
+
+> GLP-3.0 License
+
+THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+> Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+
+## Thanks
+
+None of this would be possible without the [GCC](https://gcc.gnu.org/), [GNU](https://www.gnu.org/home.en.html), 
+[Free Software Foundation](https://www.fsf.org/), the [Linux Foundation](https://www.linuxfoundation.org/), the [Linaro](https://www.linaro.org/) and the innumerable __Unknown Open Source contributors__. 
+Many thanks for the strong open source contribution.
+
+## Contributions
+
+Any contribution is welcome.
+