docs: add python dag-pb implementation to readme and makefile

Author: 0-th

Makefile

@@ -1,8 +1,9 @@
 JS_DIR=js
 GO_DIR=go
 RUST_DIR=rust
+PYTHON_DIR=python
 
-.PHONY: all testjs testgo testrust _build car build clean
+.PHONY: all testjs testgo testrust testpy _build car build clean
 
 all: testjs testgo testrust
 
@@ -18,6 +19,9 @@ testgo:
 testrust:
 	cd $(RUST_DIR) && cargo test -- --nocapture
 
+testpy:
+	cd $(PYTHON_DIR) && pytest
+
 _build:
 	cd $(JS_DIR) && npm run build
 

README.md

@@ -65,6 +65,13 @@ Fixtures are tested against the [libipld](https://github.com/ipld/libipld) stack
 * DAG-CBOR: [libipld-cbor](https://crates.io/crates/libipld-cbor)
 * DAG-JSON: [libipld-json](https://crates.io/crates/libipld-json)
 
+### Python
+
+Fixtures are tested against the [ipld-dag-pb](https://github.com/storacha/py-ipld-dag-pb)
+library:
+
+* DAG-PB: [ipld-dag-pb](https://pypi.org/project/ipld-dag-pb/)
+
 ## Running tests
 
 ### JavaScript
@@ -104,6 +111,18 @@ Or in the [rust](./rust/) directory, run:
 cargo test -- --nocapture
 ```
 
+## Python
+
+```bash
+make testpy
+```
+
+Or in the [python](./python/) directory, run:
+
+```bash
+pytest
+```
+
 ## Generating testmark output for ipld.io
 
 Each codec tested here has a corresponding file in the https://github.com/ipld/ipld repository which generates the https://ipld.io website containing the fixture data in [testmark](https://github.com/warpfork/go-testmark) format. The filename per codec is is `specs/codecs/<CODEC>/fixtures/cross-codec/index.md`.