Create README.md

Author: Stan van Rooy

README.md

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+# Elfsquad.ParseableSerilogSink
+
+## Usage
+
+```c#
+var parseableSinkOptions = new ParseableSinkOptions
+{
+    Host = "localhost:8000",
+    Stream = "teststream",
+    BatchSizeLimit = 100,
+};
+
+builder.UseSerilog((_, services, configuration) =>
+{
+    configuration
+        .WriteTo.Parseable(parseableSinkOptions)
+    ...
+}
+```