Add Missing data issue template

.github/ISSUE_TEMPLATE/missing-data.md

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+---
+name: Missing Data
+about: Report data which needs to be added to the database
+title: 'Data ingest request from: <publication>'''
+labels: data ingestion
+assignees: ''
+
+---
+
+Please provide as much information as possible about the data you think should be added. 
+
+# Source/survey/catalogue name(s)
+
+# SIMBAD/CDS/Vizier link to data source(s), if available
+
+# What data needs to be added?
+
+# Reference(s) paper for the data

.github/ISSUE_TEMPLATE/missing-data.yml

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+name: Missing Data
+description: Report missing data from the database
+title: 'Data ingest request from: <publication>'
+labels: ["data ingestion"]
+assignees: ''
+
+---
+body:
+  - type: textarea
+    attributes:
+      label: source name
+      description: Source/survey/catalogue name(s)
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: link
+      description: SIMBAD/CDS/Vizier link to data source(s), if available
+    validations:
+      required: false
+  - type: textarea
+    attributes:
+      label: data
+      description: Describe the data that needs to be added
+    validations:
+      required: false
+  - type: textarea
+    attributes:
+      label: ref
+      description: Reference(s) paper for the data
+    validations:
+      required: false
+  - type: textarea
+    attributes:
+    label: Anything else?
+    description: |
+      Anything that will give us more context about the data you think needs to be added.
+    validations:
+      required: false