Add Thrifty

[tiehfood]

Thanks for taking the time to suggest an addition to awesome-selfhosted!

Please fill out information below (all fields are mandatory unless noted otherwise):

# software name
name: "Thrifty"
# URL of the software project's homepage
website_url: "https://github.com/tiehfood/thrifty"
# URL where the full source code of the program can be downloaded
source_code_url: "https://github.com/tiehfood/thrifty"
# description of what the software does, shorter than 250 characters, sentence case
description: "A simple monthly income and expenses tracker."
# list of license identifiers, see https://github.com/awesome-selfhosted/awesome-selfhosted-data/blob/master/licenses.yml for the full list of licenses
licenses:
  - BSD-2-Clause
# list of languages/platforms, see https://github.com/awesome-selfhosted/awesome-selfhosted-data/tree/master/platforms for the full list of platforms
platforms:
  - Svelte
  - Go
  - Docker
# list of tags (categories), see https://github.com/awesome-selfhosted/awesome-selfhosted-data/tree/master/tags for the full list of tags
tags:
  - Money, Budgeting & Management
  - Resource Planning

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• Submit one item per issue. This eases reviewing and speeds up inclusion.
• You have searched the repository for any relevant issues or PRs, including closed ones.
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• Any software project you are adding to the list is actively maintained.
• Any software project you are adding was first released more than 4 months ago.
• Any software project you are adding has working installation instructions.