Update issue templates

.github/ISSUE_TEMPLATE/extractions-request.md

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+---
+name: Extractions request
+about: "[extractions] "
+title: ''
+labels: extractions wanted
+assignees: auraoupa
+
+---
+
+I have checked the available data in the [catalog](https://meom-group.github.io/meom-data-catalog/index.html) but could not find my bliss
+
+I would need an extraction with these specifications :
+  - simulation : (check the list [here](https://meom-group.github.io/meom-data-catalog/simulations.html)
+  - region : ( check the [list](https://meom-group.github.io/meom-data-catalog/regions.html) or specifiy a rectangular lat/lon region or a station and a short name)
+  - period : (check the specifications of the simulations you are targeting)
+  - variables : (check the list [here](https://meom-group.github.io/meom-data-catalog/variables.html)
+  - other post computation :  (like daily average, spatial degradation, combination of variables)
+  - platform : (available [options](https://meom-group.github.io/meom-data-catalog/platforms.html)