docs: add awesome-selfhosted submission files

Prepared oikos.yml and issue template for awesome-selfhosted-data.
Submission blocked until first release (v0.1.0, 2026-03-30) is 4 months old (earliest: 2026-07-30).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/awesome-selfhosted/issue-addition.md

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+---
+name: Addition
+about: Add new software to the list.
+title: Add Oikos
+labels: addition, reviewers wanted
+assignees: ''
+---
+
+Thanks for taking the time to suggest an addition to awesome-selfhosted!
+
+Please fill out information below (all fields are mandatory unless noted otherwise):
+
+```yaml
+# software name
+name: "Oikos"
+# URL of the software project's homepage
+website_url: "https://ulsklyc.github.io/oikos/"
+# URL where the full source code of the program can be downloaded
+source_code_url: "https://github.com/ulsklyc/oikos"
+# description of what the software does, shorter than 250 characters, sentence case
+description: "Family planner with shared tasks, shopping lists, meal planning, calendar sync (Google & iCloud), budget tracking, notes, and contacts. PWA with offline support."
+# list of license identifiers, see https://github.com/awesome-selfhosted/awesome-selfhosted-data/blob/master/licenses.yml for the full list of licenses
+licenses:
+  - MIT
+# list of languages/platforms, see https://github.com/awesome-selfhosted/awesome-selfhosted-data/tree/master/platforms for the full list of platforms
+platforms:
+  - Nodejs
+  - Docker
+# list of tags (categories), see https://github.com/awesome-selfhosted/awesome-selfhosted-data/tree/master/tags for the full list of tags
+tags:
+  - Groupware
+  - Task Management & To-do Lists
+  - Money, Budgeting & Management
+  - Recipe Management
+```
+
+To ensure your issue is dealt with swiftly, please check the following (check the boxes `[x]`):
+- [x] Submit one item per issue. This eases reviewing and speeds up inclusion.
+- [x] You have searched the repository for any relevant [issues](https://github.com/awesome-selfhosted/awesome-selfhosted-data/issues) or [PRs](https://github.com/awesome-selfhosted/awesome-selfhosted-data/pulls), including closed ones.
+- [x] Any software you are adding is not already listed at any of [awesome-sysadmin](https://github.com/awesome-foss/awesome-sysadmin), [staticgen.com](https://www.staticgen.com/), [staticsitegenerators.bevry.me](https://staticsitegenerators.bevry.me/), [dbdb.io](https://dbdb.io/browse).
+- [x] 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.
+- [x] Any software project you are adding has working installation instructions.

docs/awesome-selfhosted/oikos.yml

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+name: Oikos
+website_url: "https://ulsklyc.github.io/oikos/"
+source_code_url: "https://github.com/ulsklyc/oikos"
+description: "Family planner with shared tasks, shopping lists, meal planning, calendar sync (Google & iCloud), budget tracking, notes, and contacts. PWA with offline support."
+licenses:
+  - MIT
+platforms:
+  - Nodejs
+  - Docker
+tags:
+  - Groupware
+  - Task Management & To-do Lists
+  - Money, Budgeting & Management
+  - Recipe Management