renamed games folder to entries folder (also contained frameworks, libraries, ...) and added to the backlog

entries/lzma_sdk.md

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+# LZMA SDK
+
+_The LZMA SDK provides the documentation, samples, header files, libraries, and tools you need to develop applications that use LZMA compression._
+
+- Home: http://7-zip.org/
+- Media: https://en.wikipedia.org/wiki/Lempel%E2%80%93Ziv%E2%80%93Markov_chain_algorithm
+- State: mature
+- Download: http://7-zip.org/download.html, http://7-zip.org/sdk.html
+- Keywords: library
+- Code repository: (see download)
+- Code language: C
+- Code license: LGPL-2.0
+
+Windows only.
+For Linux see [p7zip](https://sourceforge.net/projects/p7zip/), a command line tool (see also [here](https://www.linux.com/learn/handling-rar-and-7-zip-archives-linux)).
+
+## Building
+
+The binary LZMA SDK is licensed as PD.
+