Add rough draft of big map reference page to docs

gitlab-pages/docs/reference/big_map.md

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+---
+id: big-map-reference
+title: Big Map
+---
+
+## Big_map.find_opt(k: a', m: (a',b') big_map) : b' option
+
+Retrieve the value associated with a particular key. This version returns an option
+which can either shift logic in response to a missing value or throw an error.
+
+<!--DOCUSAURUS_CODE_TABS-->
+<!--Pascaligo-->
+```pascaligo
+const my_balance : option(move) =
+  moves [("tz1gjaF81ZRRvdzjobyfVNsAeSC6PScjfQwN": address)]
+```
+
+<!--CameLIGO-->
+
+```cameligo
+let my_balance : move option =
+  Big_map.find_opt ("tz1gjaF81ZRRvdzjobyfVNsAeSC6PScjfQwN": address) moves
+```
+
+<!--ReasonLIGO-->
+
+```reasonligo
+let my_balance : option(move) =
+  Big_map.find_opt("tz1gjaF81ZRRvdzjobyfVNsAeSC6PScjfQwN": address, moves);
+```
+<!--END_DOCUSAURUS_CODE_TABS-->
+
+## Big_map.find(k: a', m: (a', b') big_map) : b'
+
+Forcefully retrieve the value associated with a particular key. If that value
+doesn't exist, this function throws an error.
+
+<!--DOCUSAURUS_CODE_TABS-->
+<!--Pascaligo-->
+```pascaligo
+const my_balance : move =
+  get_force (("tz1gjaF81ZRRvdzjobyfVNsAeSC6PScjfQwN": address), moves);
+```
+
+<!--CameLIGO-->
+
+```cameligo
+let my_balance : move =
+  Big_map.find ("tz1gjaF81ZRRvdzjobyfVNsAeSC6PScjfQwN": address) moves
+```
+
+<!--ReasonLIGO-->
+
+```reasonligo
+let my_balance : move =
+  Big_map.find ("tz1gjaF81ZRRvdzjobyfVNsAeSC6PScjfQwN": address, moves);
+```
+
+<!--END_DOCUSAURUS_CODE_TABS-->
+
+## Big_map.update(k: a', v: b', m: (a', b') big_map) : (a', b') big_map
+
+Change the value associated with a particular key, if that value doesn't already
+exist add it.
+
+<!--DOCUSAURUS_CODE_TABS-->
+
+<!--Pascaligo-->
+
+The values of a PascaLIGO big map can be updated using the ordinary
+assignment syntax:
+
+```pascaligo
+
+function set_ (var m : moveset) : moveset is
+  block {
+    m [("tz1gjaF81ZRRvdzjobyfVNsAeSC6PScjfQwN": address)] := (4,9);
+  } with m
+```
+
+<!--Cameligo-->
+
+```cameligo
+let updated_map : moveset =
+  Big_map.update ("tz1gjaF81ZRRvdzjobyfVNsAeSC6PScjfQwN": address) (Some (4,9)) moves
+```
+
+<!--Reasonligo-->
+
+```reasonligo
+let updated_map : moveset =
+  Big_map.update(("tz1gjaF81ZRRvdzjobyfVNsAeSC6PScjfQwN": address), Some((4,9)), moves);
+```
+
+<!--END_DOCUSAURUS_CODE_TABS-->
+
+## Big_map.add(k: a', v: b', m: (a', b') big_map) : (a', b') big_map
+
+## Big_map.remove(k: a', m: (a', b') big_map) : (a', b') big_map
+
+Remove a key and its associated value from the big map.
+
+<!--DOCUSAURUS_CODE_TABS-->
+
+<!--PascaLIGO-->
+```pascaligo
+function rm (var m : foo) : foo is block {
+  remove 42 from map m;
+} with m
+```
+
+<!--CameLIGO-->
+```cameligo
+let rm (m : foo) : foo = Big_map.remove 42 m
+```
+
+<!--ReasonLIGO-->
+```reasonligo
+let rm = (m: foo): foo => Big_map.remove(42, m);
+```
+
+<!--END_DOCUSAURUS_CODE_TABS-->
+
+## Big_map.literal(key_value_pair_list: (a', b') list) : (a', b') big_map
+
+Constructs a big map from a list of key-value pair tuples.
+
+<!--DOCUSAURUS_CODE_TABS-->
+<!--Pascaligo-->
+
+```pascaligo
+const moves: moveset =
+  big_map
+    ("tz1KqTpEZ7Yob7QbPE4Hy4Wo8fHG8LhKxZSx": address) -> (1,2);
+    ("tz1gjaF81ZRRvdzjobyfVNsAeSC6PScjfQwN": address) -> (0,3);
+  end
+```
+
+<!--CameLIGO-->
+
+```cameligo
+let moves: moveset =
+  Big_map.literal [
+    (("tz1KqTpEZ7Yob7QbPE4Hy4Wo8fHG8LhKxZSx": address), (1,2));
+    (("tz1gjaF81ZRRvdzjobyfVNsAeSC6PScjfQwN": address), (0,3));
+  ]
+```
+
+<!--ReasonLIGO-->
+
+```reasonligo
+let moves: moveset =
+  Big_map.literal ([
+    ("tz1KqTpEZ7Yob7QbPE4Hy4Wo8fHG8LhKxZSx": address, (1,2)),
+    ("tz1gjaF81ZRRvdzjobyfVNsAeSC6PScjfQwN": address, (0,3)),
+  ]);
+```
+
+<!--END_DOCUSAURUS_CODE_TABS-->
+
+
+## Big_map.empty() : (a', b') big_map
+
+Create an empty big map.
+
+<!--DOCUSAURUS_CODE_TABS-->
+
+<!--PascaLIGO-->
+```pascaligo
+const empty_big_map : big_map(int,int) = big_map end
+```
+
+<!--CameLIGO-->
+```cameligo
+let empty_map : foo = Big_map.empty
+```
+
+<!--ReasonLIGO-->
+```reasonligo
+let empty_map: foo = Big_map.empty;
+```
+
+<!--END_DOCUSAURUS_CODE_TABS-->
+