postman export and readme files are added.

Author: rernas35

clickhouse-r2dbc/README.md

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+# clickhouse-r2dbc
+
+This module provides r2dbc support to clickhouse-jdbc driver.
+
+r2dbc link : https://r2dbc.io/
+
+Sample code: 
+```java
+ConnectionFactory connectionFactory = ConnectionFactories
+        .get("r2dbc:clickhouse:http://{username}:{password}@{host}:{port}/{database}");
+
+        Mono.from(connectionFactory.create())
+        .flatMapMany(connection -> connection
+        .createStatement("select domain, path,  toDate(cdate) as d, count(1) as count from clickdb.clicks where domain = :domain group by domain, path, d")
+        .bind("domain", domain)
+        .execute())
+        .flatMap(result -> result
+        .map((row, rowMetadata) -> String.format("%s%s[%s]:%d", row.get("domain", String.class), 
+                                                                row.get("path", String.class), 
+                                                                row.get("d", LocalDate.class), 
+                                                                row.get("count", Long.class)) ))
+        .doOnNext(System.out::println)
+        .subscribe();
+```
+
+for full example please check clickhouse-jdbc/examples/clickhouse-r2dbc-samples/clickhouse-r2dbc-spring-webflux-sample .

examples/clickhouse-r2dbc-samples/clickhouse-r2dbc-spring-webflux-sample/README.md

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+#clickhouse-r2dbc-spring-webflux-sample
+
+This is a sample rest api which will insert clicks and get the list of clicks per day.
+
+In order to run the application;
+- Go clickhouse-jdbc/examples/clickhouse-r2dbc-samples/misc/docker and run; 
+``` docker-compose up -d ```
+- Execute the table creation sql at clickhouse-jdbc/examples/clickhouse-r2dbc-samples/clickhouse-r2dbc-spring-webflux-sample/src/main/resources/init.sql .
+- Import the postman export clickhouse-jdbc/examples/clickhouse-r2dbc-samples/clickhouse-r2dbc-spring-webflux-sample/src/main/resources/postman .
+- Run the application by using Application.java .
+- Create some clicks by postman and list daily clicks per domain and path. 

examples/clickhouse-r2dbc-samples/clickhouse-r2dbc-spring-webflux-sample/src/main/resources/postman/clickhouse-r2dbc-sample.postman_collection.json

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+{
+	"info": {
+		"_postman_id": "42544c65-9bda-4155-b00c-68bf62de19c2",
+		"name": "clickhouse-r2dbc-sample",
+		"schema": "https://schema.getpostman.com/json/collection/v2.1.0/collection.json"
+	},
+	"item": [
+		{
+			"name": "List Clicks",
+			"request": {
+				"method": "GET",
+				"header": [],
+				"url": {
+					"raw": "http://localhost:8080/clicks/google.com",
+					"protocol": "http",
+					"host": [
+						"localhost"
+					],
+					"port": "8080",
+					"path": [
+						"clicks",
+						"google.com"
+					]
+				}
+			},
+			"response": []
+		},
+		{
+			"name": "Create Clicks",
+			"request": {
+				"method": "POST",
+				"header": [],
+				"body": {
+					"mode": "raw",
+					"raw": "{\n    \"domain\" : \"google.com\",\n    \"path\" : \"/mail\"\n}",
+					"options": {
+						"raw": {
+							"language": "json"
+						}
+					}
+				},
+				"url": {
+					"raw": "http://localhost:8080/clicks",
+					"protocol": "http",
+					"host": [
+						"localhost"
+					],
+					"port": "8080",
+					"path": [
+						"clicks"
+					]
+				}
+			},
+			"response": []
+		}
+	]
+}