add dictionaries and add accessing with a value

src/parser/dictionary/dictionary.h

@@ -0,0 +1,16 @@
+#ifndef DICTIONARY_H
+#define DICTIONARY_H
+#include "../../lexer/token.h" // for Token
+#include "../parser.h"
+
+typedef struct {
+  ParsedValue * key;
+  ParsedValue * value;
+} ParsedDictionaryEntry;
+
+ParsedValue *parse_dictionary(char *file, DArray *tokens,
+                      size_t *index);
+
+void free_parsed_dictionary(void *ptr);
+
+#endif // DICTIONARY_H