Missing llama-index-readers-file package

[lovenemesis]

In the section of

Install llamafile integrations and SimpleWebPageReader

pip install llama-index-embeddings-llamafile llama-index-llms-llamafile llama-index-readers-web

llama-index-readers-file should be added as one of the integrations, otherwise a package not found issue will be reported while executing the line

local_doc_reader = SimpleDirectoryReader(input_dir='./data')

Similar to the issue reported at run-llama/llama_index#11336