Add readthedocs and mkdocs config and docs stubs

.readthedocs.yaml

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+# Read the Docs configuration file for MkDocs projects
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
+
+# Required
+version: 2
+
+# Set the version of Python and other tools you might need
+build:
+  os: ubuntu-22.04
+  tools:
+    python: "3.11"
+
+mkdocs:
+  configuration: mkdocs.yml
+
+# Optionally declare the Python requirements required to build your docs
+python:
+  install:
+  - requirements: docs/requirements.txt

docs/index.md

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+# Welcome to ATMOSPEC
+
+**WARNING: This documentation is a work in progress, please check back later. :-)**
+
+Welcome to the ATMOSPEC documentation!
+For a quick intro to how the program looks and works, take a look at this [short screencast](https://youtu.be/1ePj1hhOFdw).
+
+## Installation
+
+### Install dependencies
+0. [Install ORCA](https://www.orcasoftware.de/tutorials_orca/first_steps/install.html)
+
+NOTE: If you're downloading for Linux, choose the "shared-version", which has much smaller download size.
+
+1. [Install Docker](https://docs.docker.com/engine/install/#server)
+
+```console
+sudo apt install docker.io
+```
+
+Then add yourself to the `docker` unix group and restart the shell session
+
+```console
+sudo usermod -a -G docker $USER
+```
+
+2. Install pipx
+
+```console
+sudo apt install python-venv pipx
+```
+
+3. Install `aiidalab-launch` to manage the AiiDAlab containers
+
+```console
+pipx install aiidalab-launch
+```
+
+If pipx is giving you trouble, you should be able to install via pip as well.
+
+TODO: Take this from README
+
+## Quick guide
+
+TODO: Screenshots here
+
+## Acknowledgements
+
+This project has been funded by European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (Grant agreement No. 803718, [project SINDAM](https://cordis.europa.eu/project/id/803718)), and the EPSRC Grant EP/V026690/1 [UPDICE](https://updiceproject.com).

docs/requirements.txt

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+mkdocs~=1.5.0

mkdocs.yml

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+site_name: Atmospec Docs