added structure & interpreter & lexer & first ast stucture

doc/target/main.bl

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+use test1 from Tests;
+use test2 as test3 from Tests;
+
+lib Main {
+    class Program {
+        func Main(args: list): void {
+            test_a = test1();
+            test_a.dec_vars();
+            test_a.is_error();
+            if (!error) {
+                test_b = test3();
+                test3.continue();
+            }
+        }
+    }
+}

doc/target/test.bl

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+lib Tests
+{
+    /*
+        declaration of some tests
+    */
+    export class test1
+    {
+        export test_string: string = 'Hello';
+        export test_string_2: string = "Hello World";
+        export test_num: num = 1;
+        export test_num_2: num = 1.0;
+        export test_num_3: num = this.test_num + this.test_num_2;
+
+        export func dec_vars(): void
+        {
+            test_bool: bool = true;
+            test_bool_2: bool = false;
+            test_bool_3: bool = test_bool != test_bool_2;   # true
+        }
+
+        export is_error(): bool
+        {
+            if (error != empty)
+            {
+                output(error.code + ' ' + error.message);
+            }
+            else
+            {
+                output('continue');
+            }
+        }
+    }
+}

doc/target/test2.bl

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+lib Tests {
+    export class test2 {
+        string_a = string1();
+        export func continue() {
+            input(string_a.string1 + ': ');
+        }
+    }
+
+    class strings {
+        public string1 = "hello world";
+    }
+}