[DOCS] Solutions' cost information (#109)

* DQ-172

* Adding pricing calculation

Author: egorodov

README.md

@@ -64,6 +64,88 @@ The tool can be used as a standard Terraform module, with deployment examples pr
 
 See the [functions](https://github.com/provectus/data-quality-gate/tree/main/functions) for further details.
 
+## Pricing
+
+This solution is completely free because it is open source. However, if you want to integrate it into a live/production environment, there will be associated costs due to its cloud-based nature. These costs can be divided into two parts: the required infrastructure (which you may already have in place, such as VPCs and subnets) and the AWS services necessary for data quality implementation.
+
+*Note: All the information provided below has been calculated using the maximum score strategy.*
+#### Pricing for required infrastructure
+
+| AWS Service  | Approximate monthly cost| Description |
+| ------------- | -------------  | ------------- |
+| AWS S3 and DynamoDB endpoints  | - | There is no extra charge for gateway-type endpoints. You only pay for the usage of S3 and DynamoDB itself. |
+| AWS Interface VPC endpoints(secrets manager, monitoring, sns) | 3 endpoints * (30 days * 24 hours * 0.01 rate) = 21.6 USD  | Interface endpoints charged by hour. 1 hour = $0.01  |
+| AWS ECRs (allure, data_test, reports, notifications) | 7 versions * (865mb + 432mb + 380mb) => 11.3gb * 0.1 rate per gb month= 1.13 USD | allure image size = 865mb, data_test image size = 432mb, reports image size = 380mb, notifications image size = 160mb. For the purpose of our calculations, let's assume we are storing 7 versions of each image. |
+| AWS QuickSight | $7.3 aprx rate per user * 5 = 36.4 USD | Let's assume you have a team consisting of 5 individuals who are interested in the QuickSight data quality dashboard. They frequently check for changes, typically 2-3 times per day. |
+
+<u>Monthly total is $59.13 US$ per month</u>
+___
+
+#### Pricing for data quality specific infrastructure
+For most of the services used by Data Quality, AWS offers a free-tier supply. Additionally, the costs for these services are typically just a fraction of a cent. To provide further clarity, below you can find a basic cost formula and a few usage examples with cost estimations.
+
+We are going to count:
+- number of AWS Lambda runs
+- number of AWS StepFunction transitions
+- web reports AWS EC2 instance running(720 hrs per month)
+
+| Description  | Formula |
+| ------------- | -------------  |
+| number of AWS Lambda runs for each | (number of data sources * number of changes * work_days_month) * lambda specific rate(depends on lambda duration and memory used) |
+| number of AWS StepFunction transitions  | number of lambda runs * 2 |
+
+##### Small
+
+Let's say we have 1000 data sources and half of them changed every day. Number of runs formula for any lambda is **(1000 data sources  * 0.5 changed * 30 days)**
+
+| AWS Service       | Number of runs | Price  |
+| ------------ | -------------- | ------ |
+| AWS Lambda AllureReport | 15000          | $8.33  |
+| AWS Lambda DataTest     | 15000          | $67.28 |
+| AWS Lambda Reports      | 15000          | $2.08  |
+| AWS StepFunctions      | 15000          | $0.65 |
+| AWS EC2 Reports S3 Gateway      | 720 hrs          | $7.25 |
+
+<u>Monthly total: 85.59 US$</u>
+
+___
+
+##### Medium
+
+Let's say we have 10000 data sources and 70% of them changed every day.
+Number of runs formula for any lambda is **(10000 data sources  * 0.7 changes * 30 days)**
+
+| AWS Service       | Number of runs | Price  |
+| ------------ | -------------- | ------ |
+| AWS Lambda AllureReport | 210k          | $203.33  |
+| AWS Lambda DataTest     | 210k          | $1028.57 |
+| AWS Lambda Reports      | 210k          | $115.83  |
+| AWS StepFunctions      | 210k          | $10.40 |
+| AWS EC2 Reports S3 Gateway      | 720 hrs          | $7.25 |
+
+<u>Monthly total: 1 365.38 US$</u>
+
+___
+
+##### Large
+
+Let's say we have 30000 data sources and all of them changed every day.
+Number of runs formula for any lambda is **(30000 data sources  * 1 changes * 30 days)**
+
+| AWS Service       | Number of runs | Price  |
+| ------------ | -------------- | ------ |
+| AWS Lambda AllureReport | 900k          | $893.34  |
+| AWS Lambda DataTest     | 900k         | $4430.06 |
+| AWS Lambda Reports      | 900k          | $518.33  |
+| AWS StepFunctions      | 900k          | $44.90 |
+| AWS EC2 Reports S3 Gateway      | 720 hrs          | $7.25 |
+
+<u>Monthly total: 5 893.88 US$</u>
+___
+
+**Price per changed data source: 0.006 US$**
+
+
 ## License
 
 Apache 2 Licensed. See [LICENSE](https://github.com/provectus/data-quality-gate/tree/main/LICENSE) for full details.