C CPP template

[ismagilli]

I have implemented C and CPP templates for this challenge.

Note for C template. I have checked all currently existing tests and have found that longest input file thru all 57 tests has length 176. Thus 1000 should be enough for the length of the array.

[ismagilli]

Small fixes thru force pushed commits:

• Few typos was fixed in solutions/cpp/01-ry8/explanation.md (app/main.c -> src/main.cpp and c -> cpp)
• codecrafers.yml was added to C template
• Trailing empty lines were added to all files
• Segmentation fault was fixed in C example ( = { 0 } was added)
• String variables were renamed (input -> file_contents)
• Code for reading from file was changed in CPP template
• Tiny typo was fixed (std:cerr -> std::cerr inside comments) in CPP template
• INPUT_BUF_LEN was removed from C template (hardcoded constant 1000 was used like 100 was hardcoded in "Build Your Own Shell" challenge)

[rohitpaulk]

Thank you for the PR! Will take a look this week once we've worked on adding course-sdk add-language support to C & C++. That'll make it easier to ensure things are consistent across all challenges (removes a lot of the rote work of copying dockerfiles etc.)

[ismagilli]

@rohitpaulk I've fixed my code but haven't push updates since I was waiting for your reply to my email. Here is the fixed code.