feat: Add UniCode class to display Unicode character ranges

WHAT the code does:
- Defines a `UniCode` class with a `main()` method.
- Declares a character `x = 0x03c8` (Greek small letter psi) but doesn’t use it directly.
- Uses two loops to print Unicode ranges:
  1. Greek and Coptic block (`0x0370` to `0x03FF`) → prints characters inline separated by spaces.
  2. Devanagari block (`0x0900` to `0x0970`) → prints characters line by line.

WHY this matters:
- Demonstrates how to work with **Unicode literals** in Java.
- Shows that `char` in Java is a 16-bit Unicode code unit.
- Useful for understanding character encoding and supporting multiple languages/scripts.

HOW it works:
1. First loop prints Greek letters and symbols.
2. Second loop prints Devanagari script characters (used in Hindi and Sanskrit).
3. Output shows actual characters, not numeric codes.

Tips & gotchas:
- The loop variable must be `char`, otherwise printed values would be integers.
- The unused `x` variable could be printed to illustrate direct Unicode literal usage.
- Be mindful of console font/encoding → not all environments can render all Unicode characters.
- Java’s `char` covers only BMP (Basic Multilingual Plane). For characters outside BMP, `int` and surrogate pairs are needed.

Use-cases:
- Educational demo for **Unicode handling in Java**.
- Useful in text-processing, localization, and multilingual applications.
- Good for exploring character sets for different writing systems.
- Can be extended to print other Unicode ranges.

Short key: class-unicode-print-greek-devanagari.

Signed-off-by: https://github.com/Someshdiwan <[email protected]>

Author: Someshdiwan

Section10Methods/PracticeProblems/src/UniCode.java renamed to Section26DateandTimeAPI/src/UniCode.java

@@ -1,10 +1,11 @@
 public class UniCode {
-    public static void main(String args[])
-    {
+    public static void main(String args[]) {
         char x = 0x03c8;
+
         for(char c = 0x0370; c <= 0x03FF; c++)
             System.out.print(c + " ");
+
         for(char b = 0x0900; b <= 0x970; b++)
             System.out.println(b);
     }
-}
+}