Add Flutter requirements

Author: Remi Rousselet

platforms/flutter/additional-requirements.md

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+# 📱 Flutter Additional Requirements
+
+# 👾 Dependencies/Architecture
+
+There are no constraints on what to use and why.\
+You can use as many dependencies as you like and use the architecture of your
+choice.
+
+But you will be expected to justify your decision.
+
+# 🚀 Starting the project
+
+The project is expected to start using the following command:
+
+```sh
+flutter pub get
+flutter run
+```
+
+Additional steps are allowed (code-generators?), but the process needs to be
+documented in the README.
+
+# 🐛 UX requirements
+
+While implementing the user stories, all loading and errors states are expected
+to be gracefully handled.
+
+This can be a simple spinner while loading and an "Oops" screen on error, but there
+need to be something.
+
+# ☑️ Submission checklist
+
+- [ ] Project is provided as zipped directory, not as a link to a repository
+      (we prefer that you don't host the project in a public repo).
+- [ ] Project builds out of the box and runs on both an Android emulator and an
+      iOS Simulator without crashes.
+- [ ] All AC met for TAB-001.
+- [ ] All AC met for TAB-002.
+- [ ] All additional requirements from this file met.