📝 Create docs skeleton

Author: LuizFCDuarte

docs/Project.toml

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+[deps]
+Documenter = "e30172f5-a6a5-5a46-863b-614d45cd2de4"

docs/make.jl

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+using Documenter
+include("../src/Sarimax.jl")
+
+DocMeta.setdocmeta!(Sarimax, :DocTestSetup, :(using Sarimax); recursive=true)
+
+makedocs(;
+    modules=[Sarimax],
+    doctest=true,
+    clean=true,
+    checkdocs=:none,
+    format=Documenter.HTML(; mathengine=Documenter.MathJax2()),
+    sitename="SARIMAX.jl",
+    authors="Luiz Fernando Duarte",
+    pages=[
+        "Home" => "index.md",
+    ],
+)
+
+deploydocs(; repo="github.com/LAMPSPUC/SARIMAX.jl.git", push_preview=true)

docs/src/index.md

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+```raw html
+<!-- Ensure that raw HTML is properly formatted -->
+<div style="width:100%; height:150px;border-width:4px;border-style:solid;padding-top:25px;
+    border-color:#000;border-radius:10px;text-align:center;background-color:#99DDFF;
+    color:#000">
+    <h3 style="color: black;">Star us on GitHub!</h3>
+    <a class="github-button" href="https://github.com/LAMPSPUC/SARIMAX.jl" data-icon="octicon-star" data-size="large" data-show-count="true" aria-label="Star LAMPSPUC/SARIMAX.jl on GitHub" style="margin:auto">Star</a>
+    <script async defer src="https://buttons.github.io/buttons.js"></script>
+</div>
+```
+
+# Sarimax.jl
+
+## Installation
+
+This package is registered so you can simply `add` it using Julia's `Pkg` manager:
+```julia
+using Pkg
+Pkg.add("SARIMAX")
+```