added syscalls content

[AnamikaSanjay]

Added content on syscalls on 13 sub topics.

• Deciphering System Calls in Linux
• Differentiating System Calls and Function Calls
• System Call Numbers and the System Call Table
• Parameter Passing in System Calls
• Legacy System Call
• Fast System Calls
• SYSENTER/SYSEXIT in 32-bit Linux
• 64-bit Fast System Calls
• System Calls across Architectures
• System Call Returns
• System Call Table
• System Call Table Initialization
• Generic System Call Table

Goal: is to serve a primer for how syscall works in Linux kernel.

• Future addition :
• [ ] how syscalls help in observability using ebpf
• [ ] description of sycalls we used in our project

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[devopstoday11]

@AnamikaSanjay Why was the networking functions content removed?

[devopstoday11]

@AnamikaSanjay Why was the networking functions content removed?

@AnamikaSanjay , please check and respond to this

[AnamikaSanjay]

@AnamikaSanjay Why was the networking functions content removed?

@AnamikaSanjay , please check and respond to this

@devopstoday11 , We are working using different type of maps and I want to review and update the content based on new map used.