Add How to get started docs (#47)

* Add a guideline docs

* Add links

content/How to get started.md

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+Welcome to Cryptography SecondBrain! This comprehensive wiki is designed to help you learn various cryptographic topics, from basic algebra to advanced Privacy Enhancing Technologies (PET). Begin by examining the ==dependency graph== to see how different cryptographic concepts are connected.
+
+#### Example - Schnorr Signature
+For example, if a learner wants to study Schnorr Signatures, they can follow these steps:
+1. Start by reading the [[Schnorr Signature]] document briefly.
+2. Study the algebraic knowledge underlying Schnorr Signatures by referring to the [[Cyclic Subgroup]] and [[Group]] in the dependency graph.
+    - Click on the nodes in the graph to navigate directly to the relevant documents.
+3. Go back and study the design of Schnorr Signatures in detail.
+4. To understand the use cases of Schnorr Signatures, study [[Digital Signature]].
+    - For deeper learning, explore public key cryptography, hashing, and other digital signature algorithms in the dependency graph.
+5. To assess the security level of Schnorr Signatures, study the [[Discrete logarithm problem]] in the dependency graph.
+
+If you encounter any issues or have questions, contact us via email at [email protected].

content/index.md

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 title: Welcome to Cryptography SecondBrain
 ---
-Welcome to Cryptography SecondBrain. This is a comprehensive wiki covering a wide range of cryptographic topics from basic algebra to various Privacy Enhancing Technologies (PET).
+Welcome to Cryptography SecondBrain. This is a comprehensive wiki covering a wide range of cryptographic topics from basic algebra to various Privacy Enhancing Technologies (PET). For newcomers, please refer to [[How to get started]] to learn how to use this wiki for your studies.
 
 Cryptography SecondBrain is an open-source project maintained by Decipher. If you have an interest in cryptography, we encourage you to contribute and share your knowledge. For more details on how to get involved, please refer to our [[Contribution guide]].
 
@@ -12,3 +12,4 @@ We have the following categories in this wiki:
 - [[Privacy Enhancing Technologies (PET)]]: Advanced cryptography focused on privacy protection.
 
 If you find any inaccuracies or issues with the management of this wiki, please contact us via email at <[email protected]>.
+