add missing files

piclib/picrin/list.scm

@@ -0,0 +1,30 @@
+(define-library (picrin list)
+  (import (picrin base list))
+
+  (export pair?
+          cons
+          car
+          cdr
+          set-car!
+          set-cdr!
+          null?
+          caar
+          cadr
+          cdar
+          cddr
+          list?
+          make-list
+          list
+          length
+          append
+          reverse
+          list-tail
+          list-ref
+          list-set!
+          list-copy
+          memq
+          memv
+          member
+          assq
+          assv
+          assoc))

piclib/picrin/symbol.scm

@@ -0,0 +1,7 @@
+(define-library (picrin symbol)
+  (import (picrin base symbol))
+
+  (export symbol?
+          symbol=?
+          symbol->string
+          string->symbol))