Update documentation: add Storage section

Feature/ui test

See merge request proj-wise2526-video2document/video2document!108

documentation.md

@@ -7,6 +7,7 @@
 4. [IPC](#ipc)
 5. [Authentication](#authentication)
 6. [UI](#ui)
+7. [Storage](#storage)
 
 ## How to run the Software
 If you read the readme file, you will see the basic setup command in order to run the program.  
@@ -37,7 +38,7 @@ The program iterates through all of the folders within `./services/modules`, and
 This map is available ANYWHERE in the backend code, even within a module, which means, you can call a module, from within a module, from within a module, from within yet another module.  
 
 ## Modules
-Building a new module is super easy, any idiot can get it done.  
+Building a new module is super easy, anyone can get it done.  
 All you need to do is follow the previously mentioned structure.  
 When you have created your module file, the `.js` file, you simply copy paste this code snippet into it.  
 ```js
@@ -52,7 +53,7 @@ module.exports = {
     }
 }
 ```
-If by this point, you cared enough to actually look at the code and the modules and so on, you might have spotted a file in `./services/modules/utility` called `example.js`.  
+If you had a look at the code and the modules and so on, you might have spotted a file in `./services/modules/utility` called `example.js`.  
 This is a template file that you can just copy paste and use as a base for your new module.  
 It has the same exact code as mentioned right above.  
 Now as for how the code works.  
@@ -217,4 +218,19 @@ This directory contains the flags used for the language selection dropdown menu.
 Pictures for the document preview are stored here.
 
 **/node_modules:**
-Contains nodes used by electron.
+Contains nodes used by electron.
+
+## Storage
+
+In the root directory of the project you will find the `storage` folder.  
+This directory is used to persist **all artifacts generated throughout the processing pipeline**, allowing each step to operate independently while still sharing results.
+
+Each module is expected to **read from and write to this directory**, depending on its responsibility in the pipeline.
+
+The storage folder contains the following sub folders:
+- **audio** stores the extracted audio from the video  
+  - **audio-snippets** store the individual speaker snippets for speaker identification
+- **documents** store the HTML files generated by the AI / LLM modules
+- **documentType** stores the premade prompt templates used for the AI calls
+- **transcriptionSummaries** store the transcripts after they have been transformed from word-level to sentence-level
+- **transcripts** store the raw transcripts returned by the transcription services