docs: reorganize examples

examples/categories/README.md

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+![SendGrid Logo](https://uiux.s3.amazonaws.com/2016-logos/email-logo%402x.png)
+
+This folder contains various examples on using the Categories endpoint of SendGrid with Java:
+
+* [Retrieve all categories (GET /categories)](RetrieveAllCategories.java)
+* [Retrieve Email Statistics for Categories (GET /categories/stats)](RetrieveStatisticsForCategories.java)
+* [Retrieve sums of email stats for each category (GET /categories/stats/sums)](RetrieveSumsForCategories.java)

examples/categories/RetrieveAllCategories.java

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+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+import com.sendgrid.*;
+
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.Map;
+
+//////////////////////////////////////////////////////////////////
+// Retrieve all categories
+// GET /categories
+
+
+public class RetrieveAllCategories {
+  public static void main(String[] args) throws IOException {
+    try {
+      SendGrid sg = new SendGrid(System.getenv("SENDGRID_API_KEY"));
+      Request request = new Request();
+      request.setMethod(Method.GET);
+      request.setEndpoint("categories");
+      request.addQueryParam("category", "test_string");
+      request.addQueryParam("limit", "1");
+      request.addQueryParam("offset", "1");
+      Response response = sg.api(request);
+      System.out.println(response.getStatusCode());
+      System.out.println(response.getBody());
+      System.out.println(response.getHeaders());
+    } catch (IOException ex) {
+      throw ex;
+    }
+  }
+}

examples/categories/RetrieveStatisticsForCategories.java

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+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+import com.sendgrid.*;
+
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.Map;
+
+//////////////////////////////////////////////////////////////////
+// Retrieve Email Statistics for Categories
+// GET /categories/stats
+
+
+public class RetrieveMailStatisticsForCategories {
+  public static void main(String[] args) throws IOException {
+    try {
+      SendGrid sg = new SendGrid(System.getenv("SENDGRID_API_KEY"));
+      Request request = new Request();
+      request.setMethod(Method.GET);
+      request.setEndpoint("categories/stats");
+      request.addQueryParam("end_date", "2016-04-01");
+      request.addQueryParam("aggregated_by", "day");
+      request.addQueryParam("limit", "1");
+      request.addQueryParam("offset", "1");
+      request.addQueryParam("start_date", "2016-01-01");
+      request.addQueryParam("categories", "test_string");
+      Response response = sg.api(request);
+      System.out.println(response.getStatusCode());
+      System.out.println(response.getBody());
+      System.out.println(response.getHeaders());
+    } catch (IOException ex) {
+      throw ex;
+    }
+  }
+}

examples/categories/RetrieveSumsForCategories.java

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+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+import com.sendgrid.*;
+
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.Map;
+
+//////////////////////////////////////////////////////////////////
+// Retrieve sums of email stats for each category [Needs: Stats object defined, has category ID?]
+// GET /categories/stats/sums
+
+
+public class RetrieveSumsForCategories {
+  public static void main(String[] args) throws IOException {
+    try {
+      SendGrid sg = new SendGrid(System.getenv("SENDGRID_API_KEY"));
+      Request request = new Request();
+      request.setMethod(Method.GET);
+      request.setEndpoint("categories/stats/sums");
+      request.addQueryParam("end_date", "2016-04-01");
+      request.addQueryParam("aggregated_by", "day");
+      request.addQueryParam("limit", "1");
+      request.addQueryParam("sort_by_metric", "test_string");
+      request.addQueryParam("offset", "1");
+      request.addQueryParam("start_date", "2016-01-01");
+      request.addQueryParam("sort_by_direction", "asc");
+      Response response = sg.api(request);
+      System.out.println(response.getStatusCode());
+      System.out.println(response.getBody());
+      System.out.println(response.getHeaders());
+    } catch (IOException ex) {
+      throw ex;
+    }
+  }
+}
+