Adding README to modules

lib/adapters/README.md

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+# axios // adapters
+
+The modules under `adapters/` are modules that handle dispatching a request and settling a `Promise` once a response is received.
+
+## Example
+
+```js
+var settle = require('../helpers/settle');
+var transformData = require('./../helpers/transformData');
+
+module.exports myAdapter(resolve, reject, config) {
+  // At this point:
+  //  - config has been merged with defaults
+  //  - request transformers have already run
+  //  - request interceptors have already run
+  
+  // Make the request using config provided/
+  // Upon response settle the Promise
+  
+  var response = {
+    data: transformData(
+      responseData,
+      responseHeaders,
+      config.transformResponse
+    ),
+    status: request.status,
+    statusText: request.statusText,
+    headers: responseHeaders,
+    config: config,
+    request: request
+  };
+
+  settle(resolve, reject, response);
+
+  // From here:
+  //  - response interceptors will run
+}
+```

lib/core/README.md

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+# axios // core
+
+The modules found in `core/` should be modules that are specific to the domain logic of axios. These modules would most likely not make sense to be consumed outside of the axios module, as their logic is too specific. Some examples of core modules are:
+
+- Dispatching requests
+- Managing interceptors
+- Handling config

lib/helpers/README.md

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+# axios // helpers
+
+The modules found in `helpers/` should be generic modules that are _not_ specific to the domain logic of axios. These modules could theoretically be published to npm on their own and consumed by other modules or apps. Some examples of generic modules are things like:
+
+- Browser polyfills
+- Managing cookies
+- Parsing HTTP headers