Added yml for read the docs

.readthedocs.yml

@@ -0,0 +1,31 @@
+# .readthedocs.yml
+# Read the Docs configuration file
+# See https://docs.readthedocs.io/en/stable/config-file/v2.html for details
+
+# Required
+version: 2
+
+build:
+  os: ubuntu-20.04
+  tools:
+    python: '3.9'
+
+# Build documentation in the docs/ directory with Sphinx
+sphinx:
+  configuration: doc/source/conf.py
+
+# Build documentation with MkDocs
+#mkdocs:
+#  configuration: mkdocs.yml
+
+# Optionally build your docs in additional formats such as PDF and ePub
+formats: all
+
+# Optionally set the version of Python and requirements required to build your docs
+python:
+  install:
+    - requirements: doc/requirements.txt
+
+submodules:
+  include: all
+  recursive: true

doc/requirements.txt

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+myst-parser>=0.16
+sphinx>=4.0
+sphinx-autobuild>=2021.0
+sphinx-book-theme>=1.0
+nbsphinx>0.9
+ipykernel
+QuadratiK