Template for starting a new resource grammar (#441)

Also addressing this https://github.com/GrammaticalFramework/gf-rgl/issues/238 with a README that adds a suggested implementation order.

src/TEMPLATE/SymbolTMP.gf

@@ -0,0 +1,73 @@
+--# -path=.:../abstract:../common:../prelude
+
+concrete SymbolTMP of Symbol = CatTMP **
+  open Prelude, ParadigmsTMP, ResTMP, (Noun=NounTMP) in {
+
+lin
+
+  --  : Symb -> PN ;                -- x
+  SymbPN i = mkPN_onRuntimeToken i.s ;
+
+  -- : Int -> PN ;                 -- 27
+  IntPN i  = mkPN_onRuntimeToken i.s ;
+
+  -- : Float -> PN ;               -- 3.14159
+  FloatPN i = mkPN_onRuntimeToken i.s ;
+
+  -- : Card -> PN ;                -- twelve [as proper name]
+  NumPN i = mkPN_onRuntimeToken (i.s ! NCard) ;
+
+lin
+--  CNIntNP cn i = {} ;
+
+  -- : Det -> CN -> [Symb] -> NP ; -- (the) (2) numbers x and y
+  CNSymbNP det cn xs =
+    let cnSymb : CN = cn ** {postmod = cn.postmod ++ xs.s}
+     in Noun.DetCN det cnSymb ;
+
+  -- : CN -> Card -> NP ;          -- level five ; level 5
+  CNNumNP cn i =
+    let cnSymb : CN = cn ** {postmod = cn.postmod ++ i.s}
+     in Noun.MassNP cnSymb ;
+
+  -- : Symb -> S ;
+  SymbS sy = sy ;
+
+  -- : Symb -> Card ;
+  SymbNum sy = mkNumeral_onRuntimeToken sy.s ;
+
+  -- : Symb -> Ord ;
+  SymbOrd sy = sy ; ---- TODO: nothing added to it. Lincat of Ord is just SS from the beginning.
+
+  oper
+    -- To make Card or PN from a runtime argument, cannot use the single + operation.
+    -- See https://inariksit.github.io/gf/2018/08/28/gf-gotchas.html#unsupported-token-gluing
+
+    mkNumeral_onRuntimeToken : Str -> LinNumeral = \str -> {
+      s = table {
+        NCard => str ;
+        NOrd  => str ++ BIND ++ "th"
+        } ;
+      n = Pl ; -- NB. probably singular for number 1
+      } ;
+
+    mkPN_onRuntimeToken : Str -> LinPN = \str -> {
+      s =
+       -- table {_ =>  -- If lincat of PN changes so that it's an inflection table, uncomment this
+         str
+         -- }
+         ;
+      n = Sg ;
+      } ;
+
+lincat
+  Symb, [Symb] = SS ;
+
+lin
+  MkSymb s = s ;
+
+  BaseSymb = infixSS "and" ; -- this comes between the last two ones
+  ConsSymb = infixSS "," ;
+
+
+}