imsi-change: import from imsi-pseudonymization

Patch-by: nhofmeyr, osmith

imsi-change/README.md

@@ -0,0 +1,26 @@
+# IMSI change SIM applet
+
+Display and change the IMSI of the SIM. This is a standalone version of a debug
+feature in the more complex IMSI Pseudonymization applet. To be used as example
+code to build other applets.
+
+### How to flash
+
+```
+$ cp .sim-keys.example .sim-keys
+$ nvim .sim-keys # adjust KIC1, KID1
+$ make flash
+```
+
+Before flashing a second time, remove the sim applet:
+
+```
+$ make remove
+```
+
+### Related
+
+* [IMSI Pseudonymization](https://osmocom.org/projects/imsi-pseudo/wiki)
+* [Shadysimply in Osmocom wiki](https://osmocom.org/projects/cellular-infrastructure/wiki/Shadysimpy)
+
+