doc: document the query DSL

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+# Searching bugs
+
+You can search bugs using a micro query language for both filtering and sorting. A query could looks like this:
+
+```
+status:open sort:edit
+```
+
+A few tips:
+
+- query are case insensitive.
+- you can combine as much qualifier as you want.
+- you can use quotation for multi-word search term. For example, use `author:"René Descartes"` to search with a complete name.
+
+
+## Filtering
+
+### Filtering by status
+
+You can filter bugs based on their status.
+
+| Qualifier       | Example                             |
+| ---             | ---                                 |
+| `status:open`   | `status:open` matches open bugs     |
+| `status:closed` | `status:closed` matches closed bugs |
+
+### Filtering by author
+
+You can filter based on the person who opened the bug.
+
+| Qualifier      | Example                                                                          |
+| ---            | ---                                                                              |
+| `author:QUERY` | `author:descartes` matches bugs opened by `René Descartes` or `Robert Descartes` |
+|                | `author:"rené descartes"` matches bugs opened by `René Descartes`                |
+
+### Filtering by label
+
+You can filter based on bug's label.
+
+| Qualifier     | Example                                                                   |
+| ---           | ---                                                                       |
+| `label:LABEL` | `label:prod` matches bugs with the label `prod`                           |
+|               | `label:"Good first issue"` matches bugs with the label `Good first issue` |
+
+### Filtering by missing feature
+
+You can filter bugs based on the absence of something.
+
+
+| Qualifier  | Example                                |
+| ---        | ---                                    |
+| `no:label` | `no:label` matches bugs with no labels |
+
+## Sorting
+
+You can sort result by adding a `sort:` qualifier to your query.
+
+### Sort by Id 
+
+| Qualifier                  | Example                                              |
+| ---                        | ---                                                  |
+| `sort:id-desc`             | `sor:id-desc` will sort bugs by their descending Ids |
+| `sort:id` or `sort:id-asc` | `sor:id` will sort bugs by their ascending Ids       |
+
+### Sort by Creation time
+
+You can sort bugs by their creation time.
+
+Note: to deal with badly set clocks in a distributed system, `git-bug` use a logical clock internally rather than timestamp to order bugs edition over time. That means that the timestamps recorded might not match the returned ordering. More on that in [the documentation](model.md#you-cant-rely-on-the-time-provided-by-other-people-their-clock-might-by-off-for-anything-other-than-just-display)
+
+| Qualifier                               | Example                                                            |
+| ---                                     | ---                                                                |
+| `sort:creation` or `sort:creation-desc` | `sor:creation` will sort bugs by their descending creation time    |
+| `sort:creation-asc`                     | `sor:creation-asc` will sort bugs by their ascending creation time |
+
+### Sort by Edition time
+
+You can sort bugs by their edition time.
+
+Note: to deal with badly set clocks in a distributed system, `git-bug` use a logical clock internally rather than timestamp to order bugs edition over time. That means that the timestamps recorded might not match the returned ordering. More on that in [the documentation](model.md#you-cant-rely-on-the-time-provided-by-other-people-their-clock-might-by-off-for-anything-other-than-just-display)
+
+| Qualifier                       | Example                                                            |
+| ---                             | ---                                                                |
+| `sort:edit` or `sort:edit-desc` | `sor:edit` will sort bugs by their descending last edition time    |
+| `sort:edit-asc`                 | `sor:edit-asc` will sort bugs by their ascending last edition time |
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