Add a section for a local workflow to CONTRIBUTING.md

CONTRIBUTING.md

@@ -1,4 +1,4 @@
-# Contributing to nipanel-python 
+# Contributing to nipanel-python
 
 Contributions to nipanel-python are welcome from all!
 
@@ -26,7 +26,26 @@ This is the command to generate the files in /src/ni/pythonpanel/v1/:
 
 # Testing
 
-- TODO: include testing steps here.
+## Simple development loop
+
+```
+# Create a new branch
+git fetch
+git switch --create users/{username}/{branch-purpose} origin/main
+
+# Install the project dependencies
+poetry install --sync
+
+# ✍ Make source changes
+
+# Run the analyzers -- see files in .github/workflows for details
+poetry run ni-python-styleguide lint
+poetry run mypy
+poetry run bandit -c pyproject.toml -r src/nipanel
+
+# Run the tests
+poetry run pytest -v
+```
 
 # Developer Certificate of Origin (DCO)
 
@@ -59,4 +78,4 @@ This is the command to generate the files in /src/ni/pythonpanel/v1/:
 (taken from [developercertificate.org](https://developercertificate.org/))
 
 See [LICENSE](https://github.com/ni/<reponame>/blob/main/LICENSE)
-for details about how \<reponame\> is licensed.
+for details about how \<reponame\> is licensed.

src/nipanel/_typing.py

@@ -13,7 +13,7 @@
 
 Do not add project-specific types to this submodule.
 
-Many of these symbosl are references to `None` at run time. Clients of this submodule should use
+Many of these symbols are references to `None` at run time. Clients of this submodule should use
 `from __future__ import annotations` to avoid parsing type hints at run time.
 """