doc: add a feature matrix

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+# User facing capabilities
+
+This document tries to give an overview of what is currently supported, and by extension where effort can be focused to bring feature completion and parity.
+
+As git-bug is a free software project, accept and rely on contributor, those feature matrices kinda define a roadmap, in the sense than anything mentioned below is a planned feature and can be worked on. This does not mean that a feature not mentioned here should not be considered, just maybe check the issue tracker and come talk about it.
+
+This document however does not show all the untold work required to support those user-facing capabilities. There has been a ton of work behind the scene and more will be required over time.
+
+✅: working  🟠: partial implementation  ❌: not working
+
+## Entities
+
+The most high level overview of what kind of entities are supported and where.
+
+|              | Core | CLI | TermUI | WebUI |
+|--------------|:----:|:---:|:------:|:-----:|
+| Identities   |  ✅   |  ✅  |   ✅    |   ✅   |
+| Bug          |  ✅   |  ✅  |   ✅    |   ✅   |
+| Board        |  🟠  | 🟠  |   ❌    |   ❌   |
+| Pull-request |  ❌   |  ❌  |   ❌    |   ❌   |
+
+More specific features across the board.
+
+|                    | Core | CLI | TermUI | WebUI |
+|--------------------|:----:|:---:|:------:|:-----:|
+| Media embedding    |  🟠  |  ❌  |   ❌    |   ❌   |
+| Fast indexing      |  ✅   |  ✅  |   ✅    |   ✅   |
+| Markdown rendering | N/A  |  ❌  |   ❌    |   ✅   |
+
+#### Identities
+
+|                         | Core | CLI | TermUI | WebUI |
+|-------------------------|:----:|:---:|:------:|:-----:|
+| Public keys             |  🟠  |  ❌  |   ❌    |   ❌   |
+| Private keys management |  🟠  |  ❌  |   ❌    |   ❌   |
+| Identity edition        |  ✅   |  ✅  |   ❌    |   ❌   |
+| Identity adoption       |  ✅   |  ✅  |   ❌    |   ❌   |
+| Identity protection     |  🟠  |  ❌  |   ❌    |   ❌   |
+
+#### Bugs
+
+|                   | Core | CLI | TermUI | WebUI |
+|-------------------|:----:|:---:|:------:|:-----:|
+| Comments          |  ✅   |  ✅  |   ✅    |   ✅   |
+| Comments edition  |  ✅   |  ✅  |   ✅    |   ✅   |
+| Comments deletion |  ✅   |  ❌  |   ❌    |   ❌   |
+| Labels            |  ✅   |  ✅  |   ✅    |   ✅   |
+| Status            |  ✅   |  ✅  |   ✅    |   ✅   |
+| Title edition     |  ✅   |  ✅  |   ✅    |   ✅   |
+| Assignee          |  ❌   |  ❌  |   ❌    |   ❌   |
+| Milestone         |  ❌   |  ❌  |   ❌    |   ❌   |
+ 
+
+## Bridges
+
+### Importers
+
+General capabilities of importers:
+
+|                                                 | Github | Gitlab | Jira | Launchpad |
+|-------------------------------------------------|:------:|:------:|:----:|:---------:|
+| **incremental**<br/>(can import more than once) |   ✅    |   ✅    |  ✅   |     ❌     |
+| **with resume**<br/>(download only new data)    |   ✅    |   ✅    |  ✅   |     ❌     |
+| **media/files**                                 |   ❌    |   ❌    |  ❌   |     ❌     |
+| **automated test suite**                        |   ✅    |   ✅    |  ❌   |     ❌     |
+
+Identity support:
+
+|                   | Github | Gitlab | Jira | Launchpad |
+|-------------------|:------:|:------:|:----:|:---------:|
+| **identities**    |   ✅    |   ✅    |  ✅   |     ✅     |
+| identities update |   ❌    |   ❌    |  ❌   |     ❌     |
+| public keys       |   ❌    |   ❌    |  ❌   |     ❌     |
+
+Bug support:
+
+|                  | Github | Gitlab | Jira | Launchpad |
+|------------------|:------:|:------:|:----:|:---------:|
+| **bug**          |   ✅    |   ✅    |  ✅   |     ✅     |
+| comments         |   ✅    |   ✅    |  ✅   |     ✅     |
+| comment editions |   ✅    |   ❌    |  ✅   |     ❌     |
+| labels           |   ✅    |   ✅    |  ✅   |     ❌     |
+| status           |   ✅    |   ✅    |  ✅   |     ❌     |
+| title edition    |   ✅    |   ✅    |  ✅   |     ❌     |
+| Assignee         |   ❌    |   ❌    |  ❌   |     ❌     |
+| Milestone        |   ❌    |   ❌    |  ❌   |     ❌     |
+
+Board support:
+
+|           | Github | Gitlab | Jira | Launchpad |
+|-----------|:------:|:------:|:----:|:---------:|
+| **board** |   ❌    |   ❌    |  ❌   |     ❌     |
+
+### Exporters
+
+**General capabilities of exporters**:
+
+|                                                 | Github | Gitlab | Jira | 
+|-------------------------------------------------|:------:|:------:|:----:|
+| **incremental**<br/>(can export more than once) |   ✅    |   ✅    |  ✅   |
+| **with resume**<br/>(upload only new data)      |   ✅    |   ✅    |  ✅   |
+| **automated test suite**                        |   ✅    |   ✅    |  ❌   |
+
+**Identity support**:
+
+|                   | Github | Gitlab | Jira |         
+|-------------------|:------:|:------:|:----:|
+| **identities**    |   ✅    |   ✅    |  ✅   |
+| identities update |   ❌    |   ❌    |  ❌   |
+
+Note: as the target bug tracker require accounts and credentials, there is only so much that an exporter can do about identities. A bridge should be able to load and use credentials for multiple remote account, but when  they are not available, the corresponding changes can't be replicated.
+
+**Bug support**:
+
+|                  | Github | Gitlab | Jira |         
+|------------------|:------:|:------:|:----:|
+| **bugs**         |   ✅    |   ✅    |  ✅   |
+| comments         |   ✅    |   ✅    |  ✅   |
+| comment editions |   ✅    |   ✅    |  ✅   |
+| labels           |   ✅    |   ✅    |  ✅   |
+| status           |   ✅    |   ✅    |  ✅   |
+| title edition    |   ✅    |   ✅    |  ✅   |
+| Assignee         |   ❌    |   ❌    |  ❌   |
+| Milestone        |   ❌    |   ❌    |  ❌   |