added p7zip to dynamic-apps

Added p7zip file compression utility to dynamic apps. This includes the root directory, README.md, libraries, binaries, and sample files.

Signed-off-by: Sina Mahdavi <sinamhdv@gmail.com>

Author: sinamhdv

p7zip/7z

@@ -0,0 +1,49 @@
+# p7zip
+
+This is the p7zip compression utility that can be used with Unikraft bincompat mode.
+
+## Content
+
+- `lib/` & `lib64/`: required libs for p7zip
+- `/7z`: the 7z main binary
+- `7z.so`, `7za`, `7zCon.sfx`, `7zr`: different code modules for p7zip that will be used by 7z binary to perform different operations.
+
+## Extracting Dynamic Libraries
+
+```console
+../extract.sh ./7z
+```
+
+## Running on Linux
+
+This will create a new archive called `archive.zip` and add the file `README.md` to it.
+
+```console
+7z a archive.zip README.md
+```
+
+This will extract the archive:
+
+```console
+7z x archive.zip
+```
+
+## Running on Unikraft
+
+This will create a new archive called `archive.zip` and add the file `README.md` to it.
+
+```console
+./run.sh -r ../dynamic-apps/p7zip /7z a archive.zip README.md
+```
+
+This will extract an archive file called `archive.zip`.
+
+```console
+./run.sh -r ../dynamic-apps/p7zip /7z x archive.zip
+```
+
+We can use this command to check that everything worked properly:
+
+```console
+7z l archive.zip
+```