Add MIT licence text

[moigagoo]

Closes #226

[moigagoo]

@jmgomez it seems like Nimble 0.22 breaks the CI:

• ❌ nimble 0.22.0: https://github.com/nim-lang/langserver/actions/runs/22092185528/job/63839913807
• ✔️ nimble 0.20.1: https://github.com/nim-lang/langserver/actions/runs/22097304513/job/63857627231

Should I report it in the Nimble repo or here?

[jmgomez]

@jmgomez it seems like Nimble 0.22 breaks the CI:

• ❌ nimble 0.22.0: https://github.com/nim-lang/langserver/actions/runs/22092185528/job/63839913807
• ✔️ nimble 0.20.1: https://github.com/nim-lang/langserver/actions/runs/22097304513/job/63857627231

Should I report it in the Nimble repo or here?

No need to report it further. Definitely an odd one as the nimble output seems right, leaning towards the test being flaky but need to look more in depth into it. Thanks!

[jmgomez]

Seems to be a flaky test: #384

Failing there for v0.20.1

[moigagoo]

@jmgomez So, can it be merged then? I mean, the probability of breaking anything by adding a license file is effectively zero.