Workflow for nanopore data

[nhhaidee]

Create workflow for nanopore data:

Added (April 13, 2022)

• The workflow handles the tricks for 8 segments of Influenza
• References of 8 Segments are pulled out automatically from NCBI database
• Variant calling and generate consensus sequences for all 8 segments

PR checklist

• [x] This comment contains a description of changes (with reason).
• [x] If you've fixed a bug or added code that should be tested, add tests!
  • [x] If you've added a new tool - add to the software_versions process and a regex to scrape_software_versions.py
  • [x] If you've added a new tool - have you followed the pipeline conventions in the contribution docs
  • [x] If necessary, also make a PR on the peterk87/nf-test-datasets repo
• [x] Make sure your code lints (nf-core lint .).
• [x] Ensure the test suite passes (nextflow run . -profile test,docker).
• [x] Usage Documentation in docs/usage.md is updated.
• [x] Output Documentation in docs/output.md is updated.
• [x] CHANGELOG.md is updated.
• [x] README.md is updated (including new tool citations and authors/contributors).