Better contribute instructions

Author: evertlammerts

README.md

@@ -46,18 +46,22 @@ pip install 'duckdb[all]'
 
 ### Cloning
 
-When you clone the repo or your fork, make sure you initialize the duckdb submodule:
+After forking this duckdb-python, we recommend you clone your fork as follows:
 ```shell
-git clone --recurse-submodules <repo>
+git clone --recurse-submodules $REPO_URL
+git remote add upstream https://github.com/duckdb/duckdb-python.git
+git fetch --all
 ```
 
-... or, if  you already have the repo locally:
+... or, if you have already cloned your fork:
 ```shell
-git clone <your-repo>
-cd <your-repo>
 git submodule update --init --recursive
+git remote add upstream https://github.com/duckdb/duckdb-python.git
+git fetch --all
 ```
 
+### Submodule update hook
+
 If you'll be switching between branches that are have the submodule set to different refs, then make your life 
 easier and add the git hooks in the .githooks directory to your local config: 
 ```shell
@@ -78,7 +82,7 @@ git config --local core.hooksPath .githooks/
 
 ```bash
 # install all dev dependencies without building the project (needed once)
-uv sync -p 3.9 --no-install-project
+uv sync -p 3.11 --no-install-project
 # build and install without build isolation
 uv sync --no-build-isolation
 ```