update scripts

scripts/add_a_method.md

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+# How to add a method
+
+## Prerequisites
+
+Make sure you have Viash and Docker installed. If not, follow [these instructions](https://openproblems.bio/documentation/fundamentals/requirements) to get everything set up.
+
+## Steps
+
+### 1. Sync the test data
+
+```bash
+scripts/download_resources.sh
+```
+
+### 2. Create a new method component
+
+Make sure to replace `foo` with the name of your method. Optionally, you can replace `python` with `r` if you are creating an R method.
+
+```bash
+common/create_component/create_component \
+  --task perturbation_prediction \
+  --language "python" \
+  --name "foo" \
+  --api_file src/api/comp_method.yaml \
+  --output "src/methods/foo"
+```
+
+### 3. Fill in metadata
+
+Edit the metadata file at `src/methods/foo/config.vsh.yaml` to describe your method.
+
+### 4. Implement the method
+
+Implement your method in the file `src/methods/foo/script.py` (or `src/methods/foo/script.R` if you are using R).
+
+### 5. Test the component
+
+```bash
+viash test src/methods/foo/config.vsh.yaml
+```