minor fixes to type definitions for datatables.net-fixedcolumns and datatables.net-select (#36852)

* Create index.d.ts

* Create LICENSE

* Create README.md

* Update README.md

* Create package.json

* Delete LICENSE

* Delete README.md

* Delete package.json

* Create datatables.net-fixedcolumns-tests.ts

* Create tslint.json

* Create tsconfig.json

* changes after tslint

* formatting

* formatting

* formatting

* correct return types
add deprecation comments

* Type definitions for datatables.net-keytable

* @armanio123: "use a string literal type to improve the dev experience"

* fix call FixedColumns Api

* add cell/cells methods

types/datatables.net-fixedcolumns/index.d.ts

@@ -22,7 +22,7 @@ declare namespace DataTables {
          * The algorithm to use. This can be one of (see below for full description):
          * 'none' | 'semiauto' | 'auto'
          */
-        heightMatch?: string;
+        heightMatch?: 'none' | 'semiauto' | 'auto';
 
         /*
          * The number of columns on the left hand side of the table to fix in place.
@@ -36,10 +36,6 @@ declare namespace DataTables {
     }
 
     interface Api {
-        fixedColumns: FixedColumnsMethodsModel;
-    }
-
-    interface FixedColumnsMethodsModel {
         /*
         * Get FixedColumns Api
         */

types/datatables.net-select/index.d.ts

@@ -81,4 +81,28 @@ declare namespace DataTables {
        */
       deselect(): Api;
     }
+
+    interface CellMethods {
+        /**
+         * Select cell
+         */
+        select(): Api;
+
+        /**
+         * Deselect a cell
+         */
+        deselect(): Api;
+    }
+
+    interface CellsMethods {
+        /**
+         * Select multiple cells
+         */
+        select(): Api;
+
+        /**
+         * Deselect cells
+         */
+        deselect(): Api;
+    }
 }