Add Roadmap Document

reference/roadmap.md

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+# Roadmap
+
+This document provides an overview of the main topics that contributors and maintainers will probably focus on in the coming months.
+
+## Topics Overview
+
+- Improve existing concept exercises (see [tracking issue](https://github.com/exercism/javascript/issues/1415))
+- Create additional concept exercises (see syllabus overview below)
+- Define the `prerequisites` and `practices` lists for all practice exercises (see [tracking issue](https://github.com/exercism/javascript/issues/960))
+- Improve the [test runner](https://github.com/exercism/javascript-test-runner/)
+  - Fix bugs
+  - Nicer output in case variables are defined outside of the test case
+  - Connect tests to tasks
+- Add [analyzer](https://github.com/exercism/javascript-analyzer/) comments for all existing concept exercises
+- Improve/update/proof-read various documentation (contributing guidelines, how to implement a concept exercise, docs, exercises/shared, reference folder)
+
+## Syllabus Overview
+
+### Concept that exists or an issue has been created
+
+- `basics`
+- `strings` (incl. string methods)
+- `numbers`
+- `booleans`
+- `conditionals` (if/else) and `comparison`
+- `for-loops` and `increment-decrement`
+- `while-loops`
+- `conditionals-switch`
+- `objects` (as key-value collections)
+- `null-undefined`
+- `functions`
+- `type-conversion` (incl. truthy/falsy)
+- `template-strings`
+- `conditionals-ternary`
+- `callbacks`
+- `arrow-functions`
+- `classes` and `prototypes`
+- `inheritance`
+- `errors`
+- `arrays` (incl. array manipulation with push, pop etc.)
+- `array-loops`
+- `array-analysis`
+- `array-transformation`
+- `array-destructering`
+- `rest-and-spread`
+- `promises`
+- `recursion`
+- `closures`
+- `sets`
+
+### Potential Future Concepts
+
+- `type-checking`
+- `maps` (should be added to the Sets exercise, WeakSet/WeakMap could be in about as first iteration)
+- `dates`
+- `async-await`
+- `JSON`
+- `randomness`
+- `regular-expressions`
+- `math`
+- getters/setters, flags, descriptors
+- `proxy`
+- `variables` (deep dive on const/let/var)
+- `immutability` (incl. freeze, could be combined with the variables concept)
+- `object-helpers` (e.g. Object.assign)
+- chars and codepoints
+- this and scope (incl. call/bind)
+- iterators and "enumerators"
+- generators/yield
+- asnyc generators and iterators
+- bit wise operators
+- modules, imports, exports, dynamic imports
+- duck-typing
+- Internationalization API
+- `bigint`
+- `symbol`
+- JSDoc comments
+- asychronicity, event loop
+- setTimeout/setInterval
+- events
+- "everything is an object" sometimes (relation of functions, arrays and primitives to objects, e.g. boxed types)