add declaring and assignment with parser LHS support

src/parser/declaration/declaration.h

@@ -0,0 +1,16 @@
+#ifndef DECLARATION_H
+#define DECLARATION_H
+#include "../parser.h"
+#include "../../lexer/token.h"  // for Token
+
+typedef struct {
+  char * name;
+  bool is_function;
+  DArray args; // string[]
+  ParsedValue * from;
+} ParsedDeclaration;
+
+// Function declaration for parsing an identifier
+ParsedValue *parse_declaration(char *file, DArray *parsed, DArray *tokens, size_t *index);
+
+#endif // DECLARATION_H