Add some standard issue templates.

.github/ISSUE_TEMPLATE/a_adding_term.md

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+---
+name: Add term
+about: Suggesting/requesting a new term in FBbi
+assignees:
+labels: 'new term request'
+---
+
+## Preferred term label
+_This should be the most precise term that refers to the concept you
+want to see represented in FBbi – not necessarily the most commonly
+used term._
+
+## Synonyms
+_If the concept is known to be referred to with several other names
+beyond the preferred term label, you may list them here. This can
+include acronyms._
+
+## Definition
+_The definition should explain how the concept differs from the
+concept(s) represented by its immediate parent term(s). Please provide
+a reference (e.g. PubMed ID or DOI) whenever possible._
+
+
+## Parent term(s)
+_Where do you think the term belong in FBbi’s hierarchy. Please note
+that a term may very well have more than one parent term._
+
+## Attribution
+_If you want to be credited as contributor to FBbi, please indicate
+your ORCID here._

.github/ISSUE_TEMPLATE/b_adding_synonym.md

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+---
+name: Add synonym
+about: Suggesting a new synonym for an existing FBbi term
+assignees:
+labels:
+---
+
+## FBbi term
+_The existing FBbi term to add a synonym to._
+
+## New synonym
+_The synonym to be added to the term._
+
+## Synonym scope
+_Indicate whether the suggested synonym is an “exact” synonym (referring
+to exactly the same concept than the original term), a “related” synonym
+(referring to a concept that is only related, not identical), a “broad”
+synonym (referring to a broader concept), or a “narrow” synonym
+(referring to a narrower concept).
+
+## Reference
+_If possible, please provide a reference (e.g. PubMed ID or DOI) where
+the use of the suggested synonym is attested._
+
+## Attribution
+_If you want to be credited as contributor to FBbi, please indicate
+your ORCID here._