pmt: Create guide for installing deb in Termux

SETUP-DEBS.md

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+### Installing pmt deb packages in Termux
+
+It's pretty simple.
+
+###### Package selection
+ - If the device is 64 bit, you should choose `arm64-v8a` package. If not, choose `armeabi-v7a` package.
+ - And of course download it.
+
+###### Setup
+ - Access downloads or wherever the package is located.
+ ```
+ # Access downloads
+ cd /sdcard/Download
+ ```
+ - Now it's time to set up.
+ ```
+ Syntax:
+     apt install ./pmt-<VARIANT>.deb
+
+ Examples:
+     apt install ./pmt-armeabi-v7a.deb
+     apt install ./pmt-arm64-v8a.deb
+ ```
+ - And enjoy!