codespell: workflow, config + 1 typo fixed!

.codespellrc

@@ -0,0 +1,3 @@
+[codespell]
+skip = .git,*.pdf,*.svg
+# ignore-words-list = 

.github/workflows/codespell.yml

@@ -0,0 +1,19 @@
+---
+name: Codespell
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+
+jobs:
+  codespell:
+    name: Check for spelling errors
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+      - name: Codespell
+        uses: codespell-project/actions-codespell@v1

preprocessing/step1_preproc.sh

@@ -47,7 +47,7 @@ cat $raw_dir/check_volumes/$output
 
 # STEP 3: unzip dicoms
 # NOTE: Look at your dcm folder and check that your dicoms end in .gz. If they end in .gz, you need to run this line.
-# Otherwise, don't run. If they have mutliple .gz.gz endings, you will have to run multiple times until they are no longer
+# Otherwise, don't run. If they have multiple .gz.gz endings, you will have to run multiple times until they are no longer
 # zipped!
 echo "unzipping session $session dicoms"
 gunzip $raw_dir/$subj_dir/dcm/*.gz # NOTE: you may have to do this multiple times if your files are double zipped