Updated documentation

README.md

@@ -14,3 +14,59 @@ Add in .env the 'WEBHOOK_CLIENT_SECRET' value.
 
 ### Converting documents from MD to ODT
 - `$ apt-get install pandoc`
+
+# Searchers
+There are 2 types of searchers: basic and compounded
+
+## Basic searcher
+There are 2 types of basic searchers: native and custom
+
+### Native basic searcher
+This type of searchers are added by default in the app and cannot be edited or deleted.
+
+- Amount of Money
+- Credit Card Number
+- Distance
+- Duration
+- Email
+- Numeral
+- Ordinal
+- Phone Numbers
+- Quantity
+- Temperature
+- Time
+- Url
+- Volume
+
+### Custom basic searcher
+You can add a custom basic searcher by clicking the 'Add regex' button found in the navbar.
+
+This searcher is a regular expression.
+
+Example: `[d\]{4}-[d\]{3}-[d\]{3}` searches, in the document, all text strings that
+have 4 digits, a dash, 3 digits, a dash, and finally 3 digits; 1234-123-123 is a valid text.
+
+## Compounded searcher
+A compounded searcher contains one or more searchers, which can be either basic or comopounded.
+
+The searchers can be listed in two ways: in rows and in columns. Each column in a row 
+extends the searching criteria and each row filters the results of the previous row.
+
+Let's take as an example the following searcher: the first row has 2 searchers, in the first column 
+we have the 'Email' native basic searcher and in the second column we have a custom basic searcher
+which searches for text strings that have a leading '#' character. The second rows has only one column
+and that column has a custom basic searcher which searches for text strings which contain the '@' character.
+After we execute the Search&Displace the first row of the searcher will be applied on the initial document content
+and will find all email addresses and all text strings which have a leading '#' character, so the operation applies 
+the searchers in the first row independently, each column extending the searching criteria.
+Then the second row will be applied on the results of the first row, so on the email addresses and the text strings 
+which have a leading '#' character, basically each row filters the results of the previous row.
+
+# Demo Steps
+- Select and upload a document file (supported files: .docx, .pdf, .odt, .txt)
+- After the file is uploaded and processed you will see it's contents on the page
+- Select searchers by clicking the 'List' button on the right, for each searcher you can input a replace value, so for example if you select the 'Email' searcher and input the replace value as 'EMAIL' then all email addresses which are found in the document will be replaced with the text EMAIL
+- After you are done with the searchers selection you can hide the panel by clicking again on the 'List' button
+- You can execute the Search&Displace by clicking on the 'Run filters' button
+- After the processing is done you will see the resulting document in the right panel, side by side with the initial document
+- You can highlight the found and replaced items by toggling the 'Highlight differences' button