Switch to poetry for packaging, use 'src/' layout

Author: greschd

.github/dependabot.yml

@@ -0,0 +1,7 @@
+version: 2
+updates:
+  - package-ecosystem: "pip"
+    directory: "/"
+    schedule:
+      interval: "daily"
+    versioning-strategy: "lockfile-only"

README.rst

@@ -34,8 +34,14 @@ Alternatively, clone and install in development mode with:
 
    git clone https://github.com/pyansys/
    cd <PyAnsys-Library>
-   pip install -e .
+   pip install poetry
+   poetry install
 
+This creates a new virtual environment, which can be activated with
+
+.. code::
+
+   poetry shell
 
 Documentation
 -------------