feat(osv_scanner): Add .gitignore and update README with output directory instructions for scanning docker images

Author: chrisguest75

48_osv_scanner/.gitignore

@@ -0,0 +1 @@
+out

48_osv_scanner/README.md

@@ -25,6 +25,10 @@ just scan-repo ../my_repo --json | jq .
 ```sh
 docker pull nginx:1.27.4
 osv-scanner scan --docker nginx:1.27.4
+
+# NOTE: It doesn't seem to be scanning the .venv or pipfile.lock in the container.
+mkdir -p ./out
+osv-scanner scan --experimental-all-packages --format=json --docker nginx:1.27.4 > ./out/nginx1.27.4.json
 ```
 
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