LITE-29416: Adding general guidelines. Tech Stack + CI/CD flow

docs/dev_guide/extensions_guidelines.md

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+This article pretends to give some guideles on tech stack, code style and tools that Connect team considers usefull and easiest to get starting with extensions.
+
+
+## Tech Stack
+
+- ORM and db toolkit: SQLAlchemy
+- Database: PostgresSQL 11 
+- Web framework: FastAPI 
+- Pagination: fastapi-pagination
+- Filtering and sorting: fastapi_filter
+- Api data representation: pydantic
+- Dependency managment: poetry
+- Docker for extension execution
+
+## Testing
+
+- PyTest
+- Factory boy: pytest-factoryboy
+- pytest-asyncio to test code that uses asyncio. 
+
+
+## Code styling
+
+### [Flake8](https://flake8.pycqa.org/en/latest/)
+
+Next we show the list of all plugins that are included by default on template's project.
+
+ * max-lines: 100
+ * max-cognitive-complexity: 15
+ * import-order-style = smarkets
+ * flake8-bugbear
+ * flake8-commas
+ * flake8-future-import
+ * flake8-import-order
+ * flake8-broken-line
+ * flake8-comprehensions
+ * flake8-debugger
+ * flake8-eradicate
+ * flake8-string-format
+
+## CI/CD
+
+### Tests workflow 
+
+By default, our bootstrap will create a github workflow with 4 jobs, 3 for backend tests, one per each one of this python versions: 3.8, 3.9, 3.10. And one more, in case it was added, to run frontend tests.
+
+## Another Tools
+
+	[Connect-cli](https://github.com/cloudblue/connect-cli)
+	[Docker compose](https://docs.docker.com/compose/)
+	[Poetry](https://python-poetry.org/docs/basic-usage/)