Add readme.md file

Author: rafek1241

readme.md

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+# XML Serializer for ReBus
+
+## Why it was created?
+
+To make transition from NServiceBus MSMQ to ReBus as much painless as possible.
+
+## Getting started
+
+```c#
+Configure.With(...)
+    .Serialization(s => s.UseXmlSerializing(settings))
+    //...
+```
+
+## Example:
+
+_Message body sent to queues_
+
+```json
+//$type - TestMessage object
+{
+    "GuidProp": "0576a0cd-13c7-4dc2-a74b-4e7419213f5a",
+    "EnumProp": 1,
+    "DateTimeProp": "2020-12-11T00:20:11.8711501"
+}
+```
+:arrow_down: :arrow_up:
+```xml
+<?xml version="1.0"?>
+<Messages xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xmlns:xsd="http://www.w3.org/2001/XMLSchema"
+    xmlns="http://tempuri.org/ReBus.Serializer.XML.UnitTests.Messages">
+    <TestMessage>
+        <GuidProp>0576a0cd-13c7-4dc2-a74b-4e7419213f5a</GuidProp>
+        <EnumProp>Success</EnumProp>
+        <DateTimeProp>2020-12-11T00:20:11.8711501</DateTimeProp>
+    </TestMessage>
+</Messages>
+```
+
+## Limitations
+
+This serializer **does not** support serialization/deserialization of collections.
+
+## Contribution
+
+It would be great if you guys would help me improve this or bring up any issues. I will work on them in free time.