DAS-2165 - Improve README.md with conda instructions.

README.md

@@ -183,16 +183,30 @@ also contains an update to the `VERSION` file.
 
 Prerequisites:
 
-  - Python 3.7+, ideally installed in a virtual environment, such as `pyenv` or
+  - Python 3.9+, ideally installed in a virtual environment, such as `pyenv` or
     `conda`.
   - A local copy of this repository.
 
+Set up conda virtual environment:
+
+```bash
+conda create --name earthdata-varinfo python=3.11 --channel conda-forge \
+    --channel defaults -y
+conda activate earthdata-varinfo
+```
+
 Install dependencies:
 
 ```bash
 $ make develop
 ```
 
+or
+
+```
+pip install -r requirements.txt -r dev-requirements.txt
+```
+
 Run a linter against package code (preferably do this prior to submitting code
 for a PR review):
 

setup.py

@@ -66,7 +66,7 @@ def get_semantic_version(current_directory: str) -> str:
     install_requires=parse_dependencies('requirements.txt'),
     extras_require={'dev': parse_dependencies('dev-requirements.txt')},
     test_suite='tests',
-    python_requires='>=3.7',
+    python_requires='>=3.9',
     license='License :: OSI Approved :: Apache Software License',
     classifiers=[
         'Programming Language :: Python',