feat: add readme's for td-tools and core

packages/core/README.md

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+# Core of node-wot
+
+The `core` of node-wot is the entry point allowing to attach dedicated bindings such as:
+* [HTTP](https://github.com/eclipse/thingweb.node-wot/blob/master/packages/binding-http)
+* [CoAP](https://github.com/eclipse/thingweb.node-wot/blob/master/packages/binding-coap)
+* ... 
+
+or to create user-specific bindings.
+
+### Prerequisites
+* `npm install @node-wot/core`
+
+
+### Examples
+
+see binding examples such as 
+* https://github.com/eclipse/thingweb.node-wot/blob/master/packages/binding-http
+* https://github.com/eclipse/thingweb.node-wot/blob/master/packages/binding-coap
+
+### More Details
+
+see https://github.com/eclipse/thingweb.node-wot/

packages/td-tools/README.md

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+# TD (ThingDescription) tools of node-wot
+
+## Getting Started
+
+In the following example it is shown how td-tools of node-wot can be used.
+
+### Prerequisites
+* `npm install @node-wot/td-tools`
+
+### Example
+
+The example parses a TD and also serializes yet another newly created TD.
+
+`node example.js`
+
+```
+// example.js
+TDTools = require("@node-wot/td-tools");
+Thing = require("@node-wot/td-tools").Thing;
+
+
+// parse TD
+let tdString = JSON.stringify({
+    id : "123",
+    title: "MyThing"
+});
+let dd = TDTools.parseTD(tdString);
+console.log("**** PARSED TD ****");
+console.log(dd);
+console.log("****");
+
+
+// init Thing and serialize to TD
+let thing = new Thing();
+thing.id = "789";
+thing["@type"] = "Thing";
+thing.support = "[email protected]"
+thing.properties = {
+    "myProp" : {
+        type: "integer"
+    }
+}
+let tdString2 = TDTools.serializeTD(thing);
+console.log("**** SERIALIZED TD ****");
+console.log(tdString2);
+console.log("****");
+```
+
+
+### More Details
+
+see https://github.com/eclipse/thingweb.node-wot/