Add missing LICENSE

[mamcx]

Description of Changes

Adding LICENSE files everywhere is missing. Closes the private ticket #1386

Expected complexity level and risk

0

Testing

Run

find . -type f -name "README.md" | while read -r cargo; do
  dir=$(dirname "$cargo")
  if [ -f "$dir/LICENSE" ] || [ -f "$dir/LICENSE.txt" ]; then
  else
    echo "$cargo is missing LICENSE"
  fi
done

find . -type f -name "README" | while read -r cargo; do
  dir=$(dirname "$cargo")
  if [ -f "$dir/LICENSE" ] || [ -f "$dir/LICENSE.txt" ]; then
  else
    echo "$cargo is missing LICENSE"
  fi
done

find . -type f -name "Cargo.toml" | while read -r cargo; do
  if grep -q "license-file" "$cargo"; then
    :
  else
    echo "$cargo is missing license-file"
  fi
done
``` to find them, plus manual inspection.

[gefjon]

Approving as code owner, not as someone with any legal or procedural knowledge.