Add Formats section and encrypted files header documents

docs/Formats/encrypted-files-header.md

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+---
+title: Header Format for Encrypted Files
+layout: default
+parent: Formats
+---
+
+## Header Format for Encrypted Files
+
+When Sare encrypts a file, it adds a header at the beginning to keep everything organized. Here's how it looks:
+
+### Magic Bytes
+
+At the very start, there are some special letters that show it's a Sare-encrypted file.
+
+- **Magic Bytes:** `CRYPTOPIA`
+
+### Header Structure
+
+The header has a few parts:
+
+1. **Version (4 bytes):** This is just a number that shows which version of encryption Sare used.
+
+2. **Metadata Length (8 bytes):** This number tells how long the metadata section is.
+
+3. **Metadata (variable length):** This part has info about how the file was encrypted. It includes stuff like what method was used to hide the key and if there's a signature.
+
+4. **Signature Length (8 bytes):** If there's a signature, this number says how long it is. If there's no signature, it's just 0.
+
+5. **Signature (variable length):** If there's a signature, it's right here. It's like a stamp that proves the file is real.
+
+### Encoding and Decoding
+
+#### Encoding
+
+To put together the header:
+
+1. Start with the magic bytes `CRYPTOPIA`.
+2. Add the version number.
+3. Write down how long the metadata part is.
+4. Write the metadata.
+5. Say how long the signature part is (if there's one).
+6. Write the signature.
+
+#### Decoding
+
+To understand the header:
+
+1. Check if it starts with `CRYPTOPIA`.
+2. Look at the version number.
+3. See how long the metadata part is, and read it.
+4. Check if there's a signature and read it if there is.
+
+### Schematics
+
+Here's a simple schematic to visualize the structure of the header:
+
+```
++-----------------+--------+-------------------------------------------+--------+-------------------------------------------+
+| Magic Bytes     | Version| Metadata Length | Metadata        | Sig Len| Signature                                  |
+| (CRYPTOPIA)     | (4 bytes)          | (8 bytes)             |            | (8 bytes)            |                                            |
++-----------------+--------+-------------------------------------------+--------+-------------------------------------------+
+```

docs/Formats/formats.md

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+---
+layout: default
+title: Formats
+nav_order: 3
+has_children: true
+---
+
+## Formats
+
+This section provides an overview of the various formats utilized within the project for encryption, metadata, and other relevant data  structures.

docs/concepts/concepts.md

@@ -1,8 +1,10 @@
 ---
 layout: default
-title: Concepts
+title: Concepts		
 nav_order: 2
 has_children: true
 ---
 
-Hello
+## Concepts
+
+The "Concepts" section provides an introduction to the fundamental ideas and theories guiding the development and implementation of the  encryption system.