Add symbol table lab notes

lab/.clang-format

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+---
+BasedOnStyle: LLVM
+ColumnLimit: 120
+IndentWidth: 8
+UseTab: ForIndentation
+BreakBeforeBraces: Linux
+
+AlignEscapedNewlines: DontAlign
+AllowShortFunctionsOnASingleLine: Empty
+AllowShortIfStatementsOnASingleLine: false
+BinPackParameters: false
+IndentCaseLabels: false
+...

lab/symbol_table.c

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+#include <stdlib.h>
+
+// ------------------------------------------------------------------- Type
+
+enum mcc_type_kind {
+	MCC_TYPE_BOOL,
+	MCC_TYPE_INT,
+	MCC_TYPE_FLOAT,
+	MCC_TYPE_STRING,
+	MCC_TYPE_BOOL_ARRAY,
+	MCC_TYPE_INT_ARRAY,
+	MCC_TYPE_FLOAT_ARRAY,
+	MCC_TYPE_STRING_ARRAY,
+};
+
+struct mcc_type {
+	enum mcc_type_kind kind;
+	size_t array_size;
+};
+
+// ------------------------------------------------------------------- AST Declaration
+
+enum mcc_ast_statement_type {
+	MCC_AST_STATEMENT_TYPE_DECLARATION,
+};
+
+struct mcc_ast_statement {
+	enum mcc_ast_statement_type type;
+	union {
+		// MCC_AST_STATEMENT_TYPE_DECLARATION
+		struct {
+			const char *identifier;
+			struct mcc_type identifier_type;
+		};
+
+        // ...
+	};
+};
+
+// ------------------------------------------------------------------- Symbol Table
+
+struct mcc_symbol_table_entry {
+	const char *identifier;
+	struct mcc_ast_statement *declaration;
+};
+
+struct mcc_symbol_table {
+	struct mcc_symbol_table_entry *entries;
+	size_t entries_count;
+	size_t entries_capacity;
+};
+
+// Creation: Traverse the AST using the visitor pattern, looking for
+// declarations. Each decleration yields a new entry in our symbol table.
+
+// Supporting scopes:
+// - Add scope enter/exit visitor callbacks
+// - Add parent pointer to symbol table