Add all the files from the interpreter repo

Signed-off-by: jmug <u.g.a.mariano@gmail.com>

pkg/ast/block.go

@@ -0,0 +1,24 @@
+package ast
+
+import (
+	"bytes"
+
+	"code.jmug.me/jmug/interpreter-in-go/pkg/token"
+)
+
+type BlockStatement struct {
+	Token      token.Token // The `{` token.
+	Statements []Statement
+}
+
+func (bs *BlockStatement) statementNode() {}
+func (bs *BlockStatement) TokenLiteral() string {
+	return bs.Token.Literal
+}
+func (bs *BlockStatement) String() string {
+	var out bytes.Buffer
+	for _, s := range bs.Statements {
+		out.WriteString(s.String())
+	}
+	return out.String()
+}