[WIP] System Contracts Documentation.

docs-sphinx/index.rst

@@ -55,6 +55,7 @@ Welcome to AElf's official documentation!
    Smart Contract API <reference/smart-contract-api/index>
    Acs Introduction <reference/acs/index>
    Command-line Interface <reference/cli/index>
+   Smart Contract <reference/smart-contract/index>
 
 
 .. toctree::

docs-sphinx/reference/smart-contract/genesis-contract.md

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+# Overview
+
+Genesis Contract, also known as the Zero Contract, is mainly used to deploy and maintain smart contracts running on the aelf blockchain.
+
+# Deploy and update contracts
+
+There is a critical data structure defined in `aelf/core.proto`, called SmartContractRegistration:
+
+```C#
+message SmartContractRegistration {
+    // The category of contract code(0: C#).
+    sint32 category = 1;
+    // The byte array of the contract code.
+    bytes code = 2;
+    // The hash of the contract code.
+    Hash code_hash = 3;
+    // Whether it is a system contract.
+    bool is_system_contract = 4;
+    // The version of the current contract.
+    int32 version = 5;
+    // The version of the contract.
+    string contract_version = 6;
+    // The address of the current contract.
+    Address contract_address = 7;
+    // Indicates if the contract is the user contract.
+    bool is_user_contract = 8;
+}
+```

docs-sphinx/reference/smart-contract/index.rst

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+Smart Contract
+===================
+
+This section gives the usages, explanations, and implementations of current
+system contracts. It’s not meant to be exhaustive. With some useful methods
+we give the demo code of interaction, these demos will be useful during
+developing user contracts.
+
+
+.. toctree::
+   :caption: Smart Contract
+   :maxdepth: 1
+
+   Genesis Contract <genesis-contract>
+   Consensus Contract <consensus-contract>
+   Multi Token Contract <multi-token-contract>
+   Cross chain Contract <cross-chain-contract>
+   Vote Contract <vote-contract>
+   Profit Contract <profit-contract>
+   Election Contract <election-contract>
+   Association Contract <association-contract>
+   Referendum Contract <referendum-contract>
+   Parliament Contract <parliament-contract>
+   Treasury Contract <treasury-contract>
+   Token Holder Contract <token-holder-contract>
+   Economic Contract <economic-contract>
+   Token Convert Contract <token-convert-contract>
+   Configuration Contract <configuration-contract>