add USAGE.md

USAGE.md

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+# INITIALIZATION
+
+```python
+import python_http_client
+
+host = "https://api.sendgrid.com"
+api_key = os.environ.get('SENDGRID_API_KEY')
+request_headers = {
+    "Authorization": 'Bearer {0}'.format(api_key)
+}
+version = 3
+client = python_http_client.Client(host=host,
+                                   request_headers=request_headers,
+version=version)
+```
+
+# Table of Contents
+
+* [CLIENT](#client)
+* [RESPONSE](#response)
+
+<a name="response"></a>
+# RESPONSE
+
+Response object holds the response or data from a return statement from a client API call. It has three main properties, status_code, headers and body, which can be retrieved via a simple call:
+
+```python
+print(response.status_code)
+print(response.headers)
+print(response.body)
+```
+
+<a name="client"></a>
+# CLIENT
+Client object that allows quick access a REST-like API. All methods return a Response object that can be treated with as explained in Response.
+
+## GET
+HTTP request to retrieve information from a source.
+
+```python
+response = client.api_keys.get()
+```
+
+```python
+response = client.api_keys._(api_key_id).get()
+```
+
+## POST
+HTTP request to send data to a source.
+
+```python
+data = {
+    "name": "My API Key",
+    "scopes": [
+        "mail.send",
+        "alerts.create",
+        "alerts.read"
+    ]
+}
+response = client.api_keys.post(request_body=data)
+# print(response) as shown above
+```
+
+## PATCH
+HTTP request to update partial resources in a source.
+
+```python
+data = {
+    "name": "A New Hope"
+}
+response = client.api_keys._(api_key_id).patch(request_body=data)
+# print(response) as shown above
+```
+
+## PUT
+HTTP request used to replace a collection or element in a source.
+
+```python
+data = {
+	"name": "The Empire Strikes Back",
+	"scopes": [
+		"user.profile.read",
+		"user.profile.update"
+	]
+}
+response = client.api_keys.put(request_body=data)
+# print(response) as shown above
+```
+
+## DELETE
+HTTP request to delete elements in a source.
+
+```python
+response = client.api_keys._(api_keys_id).delete()
+# print(response) as shown above
+```