Create fields.md

fields.md

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+The following are fields are currently available through the Discovery API. Field names refer to column A in https://docs.google.com/spreadsheets/d/1qTjXqCO4eusaxr6MGpb7ns4u6k8hmg0s6LzJWvHhmHI/edit#gid=0 . See column C (JSON-LD key) for the field name you should expect the API to expose. Field definition (col D) and Range (col F) may also be helpful.
+
+# Top-level (i.e. Bib)
+
+* Type
+* Alternative title
+* Contributor literal
+* Contributor literal by role
+* Creator literal
+* Date
+* Date created
+* Date end
+   * ✅ facetable
+* Date start
+   * ✅ facetable
+* Description
+* Dimensions
+* Supplementary content
+* Extent
+* Identifier
+* Issuance
+   * ✅ facetable
+* Label
+* Language
+   * ✅ facetable
+* Note
+* Number of items
+* OCLC number
+* Place of publication
+* Publisher literal
+   * ✅ facetable
+* Resource type
+* Subject literal
+   * ✅ facetable
+* Suppressed
+* Title
+* Title display
+* HathiTrust version
+* HathiTrust volumes
+* HathiTrust access
+
+# Item-level
+
+* Access message
+* Availability
+* Barcode
+* Call number
+* Carrier type
+   * ✅ facetable
+* Catalog item type
+* Content owner
+   * ✅ facetable
+* Delivery location
+   * ✅ facetable
+* Electronic location
+* Holding location
+   * ✅ facetable
+* Identifier
+* Media type
+   * ✅ facetable
+* Requestable
+  * ✅ facetable (planned)
+
+
+
+