Add RIS bibliography format reader.

New module, Text.Pandoc.Readers.RIS, exporting readRIS.

New input format `ris`.

Closes #7894.

1 files changed, 108 insertions, 0 deletions

diff --git a/test/command/7894.md b/test/command/7894.md
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+```
+% pandoc -f ris -t csljson
+TY  - BOOK
+AU  - Chang, C. C.
+AU  - Keisler, H. Jerome
+PY  - 1990
+ET  - 3
+TI  - Model Theory
+PU  - North-Holland Press
+PP  - Amsterdam
+KW  - model theory
+KW  - logic
+ER  -
+TY  - JOUR
+AU  - Shannon, Claude E.
+PY  - 1948
+DA  - July
+TI  - A Mathematical Theory of Communication
+T2  - Bell System Technical Journal
+SP  - 379
+EP  - 423
+VL  - 27
+ER  -
+TY  - JOUR
+T1  - On computable numbers, with an application to the Entscheidungsproblem
+A1  - Turing, Alan Mathison
+JO  - Proc. of London Mathematical Society
+VL  - 47
+IS  - 1
+KW  - decidability
+KW  - computability
+SP  - 230
+EP  - 265
+Y1  - 1937
+ER  -
+^D
+[
+  {
+    "author": [
+      {
+        "family": "Keisler",
+        "given": "H. Jerome"
+      },
+      {
+        "family": "Chang",
+        "given": "C. C."
+      }
+    ],
+    "edition": "3",
+    "id": "Chang_Keisler_1990",
+    "issued": {
+      "date-parts": [
+        [
+          1990
+        ]
+      ]
+    },
+    "keyword": "logic, model theory",
+    "publisher-place": "Amsterdam",
+    "title": "Model Theory",
+    "type": "book"
+  },
+  {
+    "author": [
+      {
+        "family": "Shannon",
+        "given": "Claude E."
+      }
+    ],
+    "container-title": "Bell System Technical Journal",
+    "id": "Shannon_1948",
+    "issued": {
+      "date-parts": [
+        [
+          1948
+        ]
+      ]
+    },
+    "page": "379-423",
+    "title": "A Mathematical Theory of Communication",
+    "type": "article-journal",
+    "volume": "27"
+  },
+  {
+    "author": [
+      {
+        "family": "Turing",
+        "given": "Alan Mathison"
+      }
+    ],
+    "container-title": "Proc. of London Mathematical Society",
+    "id": "Turing_1937",
+    "issue": "1",
+    "issued": {
+      "date-parts": [
+        [
+          1937
+        ]
+      ]
+    },
+    "keyword": "computability, decidability",
+    "page": "230-265",
+    "title": "On computable numbers, with an application to the Entscheidungsproblem",
+    "type": "article-journal",
+    "volume": "47"
+  }
+]
+```