Add abbreviated terms to system requirements files
Add abbreviated terms table to BoAT_System_Requirements_en.md.
### Overview
This technical paper describes the system requirements of the BoAT Framework (C language version) for cellular modules. BoAT is an SDK that runs on the module's application processor. For the OpenCPU cellular module, BoAT is linked and called by the application as a library. For non-OpenCPU cellular modules, BoAT's API needs to be extended to AT commands for applications on the upper MCU to call.
+### Abbreviated Terms
+|Term |Explanation |
+|:----- |:--------------------------- |
+|BoAT|Blockchain of AI Things|
+|SDK|Software Development Kit|
+|API|Application Programming Interface|
+|MCU|Microcontroller Unit|
+|RTOS|Real Time Operating System|
+|TRNG|True Random Number Generator|
+|CSPRNG|Cryptographically Secure Pseudo-Random Number Generator|
+|RTC|Real Time Clock|
+|NTP|Network Time Protocol|
+|HTTP|Hyper Text Transfer Protocol|
+|HTTPs|Hyper Text Transfer Protocol Secure|
+|CoAP|Constrained Application Protocol|
+|MQTT|Message Queuing Telemetry Transport|
+|TCP|Transmission Control Protocol|
+|TEE|Trusted Execution Environment|
+|TA|Trusted Application|
+|ECDSA|Elliptic Curve Digital Signature Algorithm|
+|SHA2|Secure Hash Algorithm 2|
+
+
## Part 1 Storage Requirements
For Ethereum/PlatONE/FISCO BCOS, the storage requirements of the BoAT Framework (C language version) itself are:
