Fix #826. Add samples for new languages

website/index/samples/sample.csp.txt

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+Content-Security-Policy: default-src 'self'; img-src *; media-src media1.com media2.com; script-src userscripts.example.com

website/index/samples/sample.mysql.txt

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+CREATE TABLE shop (
+    article INT(4) UNSIGNED ZEROFILL DEFAULT '0000' NOT NULL,
+    dealer  CHAR(20)                 DEFAULT ''     NOT NULL,
+    price   DOUBLE(16,2)             DEFAULT '0.00' NOT NULL,
+    PRIMARY KEY(article, dealer));
+INSERT INTO shop VALUES
+    (1,'A',3.45),(1,'B',3.99),(2,'A',10.99),(3,'B',1.45),
+    (3,'C',1.69),(3,'D',1.25),(4,'D',19.95);

website/index/samples/sample.pgsql.txt

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+BEGIN
+    SELECT * INTO STRICT myrec FROM emp WHERE empname = myname;
+    EXCEPTION
+        WHEN NO_DATA_FOUND THEN
+            RAISE EXCEPTION 'employee % not found', myname;
+        WHEN TOO_MANY_ROWS THEN
+            RAISE EXCEPTION 'employee % not unique', myname;
+END;

website/index/samples/sample.redis.txt

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+EXISTS mykey
+APPEND mykey "Hello"
+APPEND mykey " World"
+GET mykey

website/index/samples/sample.redshift.txt

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+create view tables_vw as
+select distinct(id) table_id
+,trim(datname)   db_name
+,trim(nspname)   schema_name
+,trim(relname)   table_name
+from stv_tbl_perm
+join pg_class on pg_class.oid = stv_tbl_perm.id
+join pg_namespace on pg_namespace.oid = relnamespace
+join pg_database on pg_database.oid = stv_tbl_perm.db_id;

website/index/samples/sample.rust.txt

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+fn main() {
+    let greetings = ["Hello", "Hola", "Bonjour",
+                     "Ciao", "こんにちは", "안녕하세요",
+                     "Cześć", "Olá", "Здравствуйте",
+                     "Chào bạn", "您好", "Hallo",
+                     "Hej", "Ahoj", "سلام"];
+
+    for (num, greeting) in greetings.iter().enumerate() {
+        print!("{} : ", greeting);
+        match num {
+            0 =>  println!("This code is editable and runnable!"),
+            1 =>  println!("¡Este código es editable y ejecutable!"),
+            2 =>  println!("Ce code est modifiable et exécutable !"),
+            3 =>  println!("Questo codice è modificabile ed eseguibile!"),
+            4 =>  println!("このコードは編集して実行出来ます！"),
+            5 =>  println!("여기에서 코드를 수정하고 실행할 수 있습니다!"),
+            6 =>  println!("Ten kod można edytować oraz uruchomić!"),
+            7 =>  println!("Este código é editável e executável!"),
+            8 =>  println!("Этот код можно отредактировать и запустить!"),
+            9 =>  println!("Bạn có thể edit và run code trực tiếp!"),
+            10 => println!("这段代码是可以编辑并且能够运行的！"),
+            11 => println!("Dieser Code kann bearbeitet und ausgeführt werden!"),
+            12 => println!("Den här koden kan redigeras och köras!"),
+            13 => println!("Tento kód můžete upravit a spustit"),
+            14 => println!("این کد قابلیت ویرایش و اجرا دارد!"),
+            _ =>  {},
+        }
+    }
+}

website/index/samples/sample.sb.txt

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+begin:
+TextWindow.Write("Enter a number: ")
+num = TextWindow.ReadNumber()
+remainder = Math.Remainder(num, 2)
+If (remainder = 0) Then
+ TextWindow.WriteLine("The number is Even")
+Else
+ TextWindow.WriteLine("The number is Odd")
+EndIf
+Goto begin