Add creational patterns, Interpreter; remove scripts; update README

01-creational/builder/Director.java

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+package builder;
+
+/** Director knows how to build common configurations */
+public class Director {
+    public House buildStarter(House.Builder builder) {
+        return builder.rooms(2).floors(1).garage(false).roofType("gabled").build();
+    }
+
+    public House buildLuxury(House.Builder builder) {
+        return builder.rooms(6).floors(3).garage(true).garden(true).pool(true).roofType("hip").build();
+    }
+}

01-creational/builder/House.java

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+package builder;
+
+public class House {
+    private final int rooms;
+    private final int floors;
+    private final boolean hasGarage;
+    private final boolean hasGarden;
+    private final boolean hasPool;
+    private final String roofType;
+
+    private House(Builder builder) {
+        this.rooms     = builder.rooms;
+        this.floors    = builder.floors;
+        this.hasGarage = builder.hasGarage;
+        this.hasGarden = builder.hasGarden;
+        this.hasPool   = builder.hasPool;
+        this.roofType  = builder.roofType;
+    }
+
+    @Override
+    public String toString() {
+        return "House{rooms=" + rooms + ", floors=" + floors
+                + ", garage=" + hasGarage + ", garden=" + hasGarden
+                + ", pool=" + hasPool + ", roof='" + roofType + "'}";
+    }
+
+    public static class Builder {
+        private int rooms = 1;
+        private int floors = 1;
+        private boolean hasGarage = false;
+        private boolean hasGarden = false;
+        private boolean hasPool   = false;
+        private String roofType   = "flat";
+
+        public Builder rooms(int rooms)           { this.rooms = rooms;         return this; }
+        public Builder floors(int floors)         { this.floors = floors;       return this; }
+        public Builder garage(boolean v)          { this.hasGarage = v;         return this; }
+        public Builder garden(boolean v)          { this.hasGarden = v;         return this; }
+        public Builder pool(boolean v)            { this.hasPool = v;           return this; }
+        public Builder roofType(String roofType)  { this.roofType = roofType;   return this; }
+        public House build()                      { return new House(this); }
+    }
+}

01-creational/builder/Main.java

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+package builder;
+
+public class Main {
+    public static void main(String[] args) {
+        System.out.println("=== Builder Pattern Demo ===\n");
+
+        Director director = new Director();
+
+        House starter = director.buildStarter(new House.Builder());
+        System.out.println("Starter home : " + starter);
+
+        House luxury = director.buildLuxury(new House.Builder());
+        System.out.println("Luxury home  : " + luxury);
+
+        // Client builds a custom house directly without the Director
+        House custom = new House.Builder()
+                .rooms(4).floors(2).garden(true).roofType("mansard").build();
+        System.out.println("Custom home  : " + custom);
+    }
+}