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Readme.md

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+
+#CSV Merge
+
+Basic Usage
+-----------
+
+![Main window](https://user-images.githubusercontent.com/2375486/65368444-a97ba500-dc5e-11e9-96a0-40143940efe2.png)
+
+Add files by dragging and dropping them into the window.
+You can also drag in whole folders and they will be recursively searched for csv files. This is useful when the actual files are structured like 'Project/Outputs/BOM.csv'.
+
+You can delete files by selecting entries from the list and hitting the delete key. You can select all by dragging or using `Ctrl+A`. 
+
+Drag and drop multiple times in case you missed something. Files won't be duplicated.
+
+Merging
+-------
+
+![Files added](https://user-images.githubusercontent.com/2375486/65368762-e5186e00-dc62-11e9-8fab-311041e63074.png)
+
+Once the files are added, just hit merge. 
+
+Some files may have a different number of headers, or the columns may be in a different order. Select one of the entries to choose which file's column order to use as output.
+
+**Note**
+
+The merged output will have a column inserted named (Source) which will contain the name of the file that contained the row.
+
+
+Consolidation
+--------------
+
+As with merge, select one of the files to choose a column order.
+
+![Consolidation screen](https://user-images.githubusercontent.com/2375486/65369354-86a2be00-dc69-11e9-9bbf-6da6978e219f.png)
+
+From the list choose one or more columns to *act as a key*.
+The combination of key fields will be used to determine the number of rows.
+
+Click on one of the `Combine` fields to choose the type of operation.
+
+###Combine operations
+
+####`Union` 
+Set union, which discards duplicates
+`A, A, B, C, A, B, D` becomes `A, B, C, D`
+
+####`Join` 
+Joins all fields with the specified separator - if none is specified, a semicolon `;` is used
+
+####`Total` 
+Sums all the fields together. A numeric type is expected. 
+
+--------------------------------------------------------------------------
+
+Example
+-------
+
+
+| Sales_Rep_ID | Postcode | Sales_Rep_Name | Year | Value   | Commission |
+| ------------ | -------- | -------------- | ---- | ------- | ---------- |
+| 456          | 2027     | Jane           | 2017 | 11,444  | 5%         |
+| 456          | 2110     | Jane           | 2017 | 30,569  | 5%         |
+| 123          | 2137     | John           | 2017 | 83,085  | 5%         |
+| 789          | 2164     | Jack           | 2017 | 82,490  | 5%         |
+| 789          | 2067     | Jack           | 2018 | 23,819  | 5%         |
+
+
+1. Choosing `Sales_Rep_ID` as the *key*, the consolidated result will have only `456, 123, 789`.
+
+| Sales_Rep_ID | Postcode   | Sales_Rep_Name | Year       | Value          | Commission |
+| ------------ | ---------- | -------------- | ---------- | -------------- | ---------- |
+| 456          | 2027, 2110 | Jane           | 2017       | 11,444, 30,569 | 5%         |
+| 123          | 2137       | John           | 2017       | 83,085         | 5%         |
+| 789          | 2164, 2067 | Jack           | 2017, 2018 | 82,490, 23,819 | 5%         |
+
+2. Choosing `Sales_Rep_ID` and `Year` as the key:
+
+| Sales_Rep_ID | Postcode   | Sales_Rep_Name | Year | Value          | Commission |
+| ------------ | ---------- | -------------- | ---- | -------------- | ---------- |
+| 456          | 2027, 2110 | Jane           | 2017 | 11,444, 30,569 | 5%         |
+| 123          | 2137       | John           | 2017 | 83,085         | 5%         |
+| 789          | 2164       | Jack           | 2017 | 82,490         | 5%         |
+| 789          | 2067       | Jack           | 2018 | 23,819         | 5%         |
+
+3. Choosing `Year` as the key, and *Total* on `Value`:
+
+| Sales_Rep_ID  | Postcode               | Sales_Rep_Name   | Year | Value  | Commission |
+| ------------- | ---------------------- | ---------------- | ---- | ------ | ---------- |
+| 456, 123, 789 | 2027, 2110, 2137, 2164 | Jane, John, Jack | 2017 | 207588 | 5%         |
+| 789           | 2067                   | Jack             | 2018 | 23819  | 5%         |
+
+
+4. Choosing `Year` as the key, and *Total* on `Value`:
+
+| Sales_Rep_ID  | Postcode               | Sales_Rep_Name   | Year | Value  | Commission |
+| ------------- | ---------------------- | ---------------- | ---- | ------ | ---------- |
+| 456, 123, 789 | 2027, 2110, 2137, 2164 | Jane, John, Jack | 2017 | 207588 | 5%         |
+| 789           | 2067                   | Jack             | 2018 | 23819  | 5%         |
+
+5. Choosing `Year` as the key, *Total* on `Value`, and *Join* on `Sales_Rep_ID` and `Sales_Rep_Name`:
+
+![Setting screen](https://user-images.githubusercontent.com/2375486/65372156-e14c1200-dc89-11e9-85fd-2a08fa7d3807.png)
+
+|Sales_Rep_ID       | Postcode               | Sales_Rep_Name         | Year | Value  | Commission |
+|------------------ | ---------------------- | ---------------------- | ---- | ------ | ---------- |
+|456; 456; 123; 789 | 2027, 2110, 2137, 2164 | Jane; Jane; John; Jack | 2017 | 207588 | 5%         |
+|789                | 2067                   | Jack                   | 2018 | 23819  | 5%         |
+
+