Refs #454 -- Added Comprasion Operators to general/build/smart-contra…

…cts/gas-optimization (#504)

* update general/conflux-basics/glossary.md, regarding the issue #455

* Update docs/general/conflux-basics/glossary.md

Co-authored-by: darwintree <17946284+darwintree@users.noreply.github.com>

* Update glossary.md

* add Comparison Operators

---------

Co-authored-by: darwintree <17946284+darwintree@users.noreply.github.com>

docs/general/build/smart-contracts/gas-optimization/LessThan.md

@@ -0,0 +1,36 @@
+---
+displayed_sidebar: generalSidebar
+---
+
+# Comparison Operators
+
+In the Ethereum Virtual Machine (EVM), the selection of comparison operators influences the efficiency and gas consumption of smart contracts. Opting for `<` (less than) and `>` (greater than) over `≤` (less than or equal to) and `≥` (greater than or equal to) is notably more gas-efficient. This is due to the absence of direct opcode instructions for `≤` and `≥` in the EVM's design, which requires additional operations to achieve these comparisons. 
+
+Given that iszero consumes 3 units of gas, utilizing `≤` and `≥` in contracts that frequently perform comparisons can lead to increased gas expenditures. 
+
+**DemoCode**
+
+Below are examples of code achieving the same result using `<` and `<=`, respectively.
+
+```solidity
+contract CompareLessThan {
+    // gas: 247
+    function isSmallerThan(uint256 value) external pure returns (bool) {
+        return value < 8;
+    }
+}
+
+contract CompareLessThanOrEqual {
+    // gas: 250
+    function isSmallerThanOrEqual(uint256 value) external pure returns (bool) {
+        return value <= 7;
+    }
+}
+```
+
+Assuming `value` is 7, both functions will return the same result. However, the `<` operator will be more gas-efficient than the `<=` operator.
+
+
+Recommendations for gas optimization:
+
+🌟 Using the `<` and `>` operators is more gas-efficient than `<=` and `>=` in smart contracts.