Add project README.

Author: ilopX

patterns/strategy/view_strategy/README.md

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+# Strategy Pattern
+Strategy is a behavioral design pattern that lets you define a family of algorithms, put each of 
+them into a separate class, and make their objects interchangeable.
+
+Tutorial: [here](https://refactoring.guru/design-patterns/strategy).
+
+## Diagram:
+![image](https://user-images.githubusercontent.com/8049534/175562829-c91fbb12-50ac-4373-a33f-900527383a6c.png)
+
+## Client code:
+```dart
+void main() {
+  final byteList = ByteContext()
+    ..add('Hello guru')
+    ..add(123456789)
+    ..add(3.1456564984);
+
+  final strFormat = byteList.toStringView(StrViewStrategy());
+  final hexFormat = byteList.toStringView(HexViewStrategy());
+  final zipFormat = byteList.toStringView(ZipViewStrategy());
+
+  print(strFormat);
+  print(hexFormat);
+  print(zipFormat);
+}
+```
+
+### Output:
+```
+StrViewStrategy:
+Hello guru, 123456789, 3.1456564984
+
+HexViewStrategy:
+Hello guru     : 48 65 6c 6c 6f 20 67 75 72 75
+123456789      : 00 00 00 00 07 5b cd 15
+3.1456564984   : 40 09 2a 4d f4 48 9f 7e
+
+ZipViewStrategy:
+1f 8b 08 00 00 00 00 00 00 0a f3 48 cd c9 c9 57 
+48 2f 2d 2a d5 51 30 34 32 36 31 35 33 b7 b0 d4 
+51 30 d6 33 04 32 4d cd 4c 2c 2d 4c b8 00 d4 70 
+cf ee 24 00 00 00 
+```