added basic readme

README.md

+# Suppressed exceptions for PHP
+
+Suppressed exceptions are useful for aggregating more exceptions with unreliable resources.
+
+You want to communicate that process failed, with following list of sibling exceptions that led to this error.
+
+```php
+$remoteSources = []; // classes representing unreliable remote sources
+
+$exceptions = [];
+foreach ($remoteSoures as $remoteSource) {
+	try {
+		$remoteSource->fetch(); // unrealiable
+	} catch (FetchingFailed $e) {
+		$exceptions[] = $e;
+		continue;
+	}
+}
+
+if (count($exceptions) > 0) {
+	$e = new ProcessingFailed();
+	$e->addSuppressed(...$exceptions);
+	throw $e;
+}
+
+```
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