adr: 006 - jan core module (#404)

adr/adr-006-jan-core-module.md

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+# ADR 006: jan-core-module
+
+## Changelog
+
+- 2023-10-19: Initial draft
+
+## Authors
+
+- Louis
+
+## Status
+
+Accepted
+
+## Context
+
+Currently, developers face several challenges while writing a plugin, which include:
+- Registering functions using the function name as a string
+- Invoking anonymous functions
+- No access to native APIs or common functions for data insertion or retrieval
+- Lack of communication between the app and plugins.
+
+## Decision
+
+Let developers install and import an npm module to develop our Plugin easier.
+
+Upon boot, Web plugs in window modules. Its components and plugins can then import the core to access exposed functions.
+
+![Jan Core Module](./images/jan-core-module.png)
+## Consequences
+
+Separate PRs should be created for updating the core and app. For instance, if a new app enhancement requires the core module to expose a new API, a new core update must be published on npm to prevent CI failure.
+
+## Alternatives
+
+## Reference