Add Definitions

Definitions.md

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+# Project definition and Scope
+
+## Main idea
+
+This project aims to extend the issue management functionality of git forges,
+allowing more complex project management workflows and provide features not
+included in the forge by itself.
+
+### What is/will be implemented:
+
+- [ ] view for repository and organization wide
+- [ ] Issue management via labels:
+    - [ ] List view
+    - [ ] Kanban Board
+- [ ] Time tracking:
+    - [ ] Pomodoro timmer
+    - [ ] Flowtime timmer
+- [ ] Dependencies / blocking visualization
+- [ ] Milestone management
+- [ ] Calendar via due dates
+- [ ] Work session[¹] management
+
+[¹]: How many _sessions_ (AKA sittins) this issue has done vs allows
+
+### What won't be implemented
+
+- A full jira clone
+- Support for every git forge
+
+### Constraints
+
+- It needs to be a stateless application:
+  - Data should come primary from the git forge
+  - For the functionality not supported by the git forge, it needs to be stored in the frontmatter of the issue description
+  - Configuration needs to be done via config file, env vars or command line arguments
+  - Data stored in the app should only be transactional and cache in an in-memory database
+- It needs to be mobile friendly
+- It needs to have an extensible design