Little more docs and linting for backend

README.md

backend/.gitignore

backend/Dockerfile

backend/README.md

backend/src/controller/cookingStepsController.ts

backend/src/controller/getRecipesForIngredient.ts

backend/src/controller/ingredientEntriesController.ts

backend/src/controller/recipeEntriesController.ts

backend/src/index.ts

package-lock.json