Add MIME type for Web App Manifest

[filips123]

BPO	37305
Nosy	@jaraco, @filips123
PRs	bpo-37305: add MIME type for Web App Manifest #14199 [3.8] bpo-37305: add MIME type for Web App Manifest (GH-14199) #15946

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2019-09-11.14:22:25.546>
created_at = <Date 2019-06-16.10:41:01.858>
labels = ['type-feature', '3.8', '3.9']
title = 'Add MIME type for Web App Manifest'
updated_at = <Date 2019-09-11.14:22:25.545>
user = 'https://github.com/filips123'

bugs.python.org fields:

activity = <Date 2019-09-11.14:22:25.545>
actor = 'jaraco'
assignee = 'none'
closed = True
closed_date = <Date 2019-09-11.14:22:25.546>
closer = 'jaraco'
components = []
creation = <Date 2019-06-16.10:41:01.858>
creator = 'filips123'
dependencies = []
files = []
hgrepos = []
issue_num = 37305
keywords = ['patch']
message_count = 4.0
messages = ['345741', '351867', '351893', '351899']
nosy_count = 2.0
nosy_names = ['jaraco', 'filips123']
pr_nums = ['14199', '15946']
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue37305'
versions = ['Python 3.8', 'Python 3.9']

[filips123]

Web App Manifest ( https://w3c.github.io/manifest/ ) is "JSON-based manifest file that provides developers with a centralized place to put metadata associated with a web application".

Although it is not required, it is recommended by W3C ( https://w3c.github.io/manifest/#media-type-registration ) that manifest uses application/manifest+json media type and .webmanifest extension.

This should also be used by Python's mimetypes module.

I can submit PR for this, but I don't know if it should be added to types_map or common_types. It is currently not registered with IANA, but it is "for community review and will be submitted to the IESG for review, approval, and registration with IANA".

If it is not strictly needed for MIME type that it is registered with IANA, I will add it to types_map. If it is, I will add it common_types and later move it to types_map when it will be registered. What should I choose?

[jaraco]

New changeset 4b41745 by Jason R. Coombs (Filip Š) in branch 'master':
bpo-37305: add MIME type for Web App Manifest (bpo-14199)
4b41745

[jaraco]

New changeset 35d0934 by Jason R. Coombs (Miss Islington (bot)) in branch '3.8':
bpo-37305: add MIME type for Web App Manifest (GH-14199) (bpo-15946)
35d0934

[jaraco]

Thanks for the contrib.