Add 3 books

Added books:
- Letters From South Korea
- Out of Their Own Mouths
- The Bloodthirsty Man

Signed-off-by: HackerNCoder <hackerncoder@encryptionin.space>

content/korea/letters-from-south-korea/contents.lr

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+title: Letters From South Korea
+---
+author: T.K.
+---
+publisher: IDOC (International Documentation)
+---
+pub_date: 1976
+---
+orig:
+https://archive.org/details/letters-from-south-korea, letters-from-south-korea.pdf

content/korea/out-of-their-own-mouths/contents.lr

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+title: Out of Their Own Mouths: Revelations & Confessions Written by American Soldiers of Torture, Rape, Arson, Looting, and Cold-Blooded Murder of Defenceless Civilians and Prisoners of War in Korea
+---
+publisher: Red Cross Society of China
+---
+pub_date: 1951
+---
+orig:
+https://archive.org/details/out-of-their-own-mouths, out-of-their-own-mouths.pdf

content/korea/the-bloodthirsty-man/contents.lr

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+title: The Bloodthirsty Man (Letters from South Korea)
+---
+author: T.K.
+---
+publisher: Foreign Languages Publishing House, Pyonguang
+---
+pub_date: 1985
+---
+orig:
+https://archive.org/details/the-bloodthirsty-man, the-bloodthirsty-man.pdf