Add README

Author: lmadhavan

README.md

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+# SimpleStream
+SimpleStream makes it easier to use Java 8 Streams by reducing the amount of boilerplate code required to perform common tasks.
+
+````java
+import static simplestream.SimpleStream.stream;
+
+Collection<Integer> values = Arrays.asList(1, 5, 2, 4, 3);
+
+/* Simpler collector methods */
+stream(values).map(x -> x + 1).toList(); // [2, 6, 3, 5, 4]
+
+/* Less confusing filtering */
+stream(values).select(x -> x % 2 == 0).toList(); // [2, 4]
+stream(values).remove(x -> x % 2 == 0).toList(); // [1, 5, 3]
+
+/* Comparison operations (for streams of Comparable elements) */
+stream(values).min(); // 1
+stream(values).max(); // 5
+stream(values).sort().toList(); // [1, 2, 3, 4, 5]
+
+/* Numeric operations (for streams of numbers) */
+stream(values).sumAsInt(); // 15
+stream(values).average(); // 3.0
+
+/* Miscellaneous operations */
+stream(values).groupBy(x -> x % 2 == 0 ? "even" : "odd"); // {even=[2, 4], odd=[1, 5, 3]}
+stream(values).contains(4); // true
+stream(values).join("+"); // "1+5+2+4+3"
+````
+
+SimpleStream is distributed in source form and contains a single source file (<code>SimpleStream.java</code>) that can be directly included in your project. You can download the latest release [here](https://github.com/lmadhavan/simplestream/releases).