added readmes

Author: polluterofminds

packages/angularjs/README.md

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+## Exceptionless Core
+
+This package is the main source of methods that inform all of the other Exceptionless JS packages. It should not be used directly. Instead, you should use one of the following pagages: 
+
+`@exceptionless/browser`
+`@exceptionless/node`
+`@exceptionless/react`
+`@exceptionless/angular`
+

packages/core/README.md

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+## Exceptionless NodeJS
+
+Using Exceptionless in the NodeJS environment is similar to using it in other JavaScript environments. 
+
+### Installation 
+
+Using npm: 
+
+`npm i @exceptionless/node`
+
+Using yarn: 
+
+`yarn add @exceptionless/node` 
+
+### Configuration 
+
+When your NodeJS app starts up, it should tell the Exceptionless client to startup like this: 
+
+```js
+await Exceptionless.startup(c => {
+  c.apiKey = "LhhP1C9gijpSKCslHHCvwdSIz298twx271n1l6xw";
+  c.serverUrl = "http://localhost:5000";
+  c.useDebugLogger();
+
+  c.defaultTags.push("Example", "Node");
+
+  // set some default data
+  c.defaultData["SampleUser"] = {
+    id: 1,
+    name: "Blake",
+    password: "123456",
+    passwordResetToken: "a reset token",
+    myPasswordValue: "123456",
+    myPassword: "123456",
+    customValue: "Password",
+    value: {
+      Password: "123456"
+    }
+  };
+});
+```
+
+Once that's done, you can use the Exceptionless client anywhere in your app by calling `Exceptionless` followed by the method you want to use. For example: 
+
+```js
+Exceptionless.submitLog("Hello, world");
+```
+
+### Using With Express 
+
+When using this package with an Express server, you should call `exceptionless.startup()` when the server starts. There are many ways to do this, but it's important that the client is instantiated before the server is used.