Added README for CP/M applications

Author: giuliof

applications/README.md

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+
+# Applications
+
+## Custom Sanco applications
+
+- CONFIG80.COM: configuration of the serial port, **disassembly in progress**;
+- COPY8003.COM: disk copy utility, **disassembly in progress**;
+- [FMT8003.COM](https://github.com/BayoDev/Sanco_8000/blob/main/CP-M/DISASSEMBLY/FMT8003_disassembly.z80): disk format utility;
+- [FUNK00.COM](FUNK00.COM.asm): keymap configuration;
+- [PAR8003.COM](PAR8003.COM.asm): configure diskette units;
+- REV.COM: delete files, **disassembly in progress**;
+- [RCX62.COM](https://github.com/BayoDev/Sanco_8000/blob/main/CP-M/DISASSEMBLY/RCX62_disassembly.z80): receive data from serial port;
+- SG8003.COM: **disassembly in progress**;
+- [SLF80037.COM](SLF80037.COM.asm): bootstrap application;
+- [TERM80.COM](https://github.com/BayoDev/Sanco_8000/blob/main/CP-M/DISASSEMBLY/TERM80_disassembly.z80): serial terminal;
+- TRX62.COM: send data through serial port, **disassembly in progress**;
+
+## CP/M system tools and applications
+
+All of these sources can be found in [cpm2-plm.zip](http://www.retroarchive.org/cpm/archive/unofficial/download/cpm2-plm.zip) from retroarchive.org.
+Some of these sources are in in [PL/M](https://it.wikipedia.org/wiki/PL/M) language, the compiler can be found in [Digital Research Source Code](http://www.retroarchive.org/cpm/archive/unofficial/source.html) page.
+
+- ASM.COM: ASM80 assembler from Digital Research;
+- DDT.COM: debugger from Digital Research;
+- DUMP.COM: dump file content;
+- LOAD.COM: from Digital Research;
+- PIP.COM: move or copy files;
+- STAT.COM: disk usage, character i/o management;
+- SUBMIT.COM: system utility from Digital Research;
+- XSUB.COM: TODO.
+
+## Third party applications
+
+- ED.COM: text editor;
+- INSTALL.COM: Microsoft Install;
+- KANABAS.COM: basic interpreter;
+- KBAS75.COM: basic interpreter;
+- KBASIC.COM: basic interpreter;
+- MP.COM: Microsoft Multiplan;
+- MBASIC.COM: basic interpreter;