add sample data using HIV dataset

src/blik/napari.yaml

@@ -7,6 +7,10 @@ contributions:
     - id: blik.read_files
       python_name: blik.reader:get_reader
       title: "Open files with blik"
+    # samples
+    - id: blik.sample_hiv_dataset
+      python_name: blik.remote_data:load_hiv_dataset
+      title: "Open sample HIV VLPs dataset"
     # writers
     - id: blik.write_image
       python_name: blik.writer:write_image
@@ -135,3 +139,8 @@ contributions:
       display_name: "Gaussian filter"
     - command: blik.power_spectrum
       display_name: "Power spectrum"
+
+  sample_data:
+    - command: blik.sample_hiv_dataset
+      key: blik_hiv_dataset
+      display_name: "Tomogram and particles of HIV VLPs"

src/blik/remote_data.py

@@ -0,0 +1,14 @@
+import pooch
+
+from .reader import read_layers
+
+
+def load_hiv_dataset():
+    reg = pooch.create(
+        path=pooch.os_cache("blik"),
+        base_url='doi:10.5281/zenodo.6504891/',
+    )
+    reg.load_registry_from_doi()
+
+    paths = [reg.fetch(f) for f in reg.registry_files]
+    return read_layers(*paths)