add README.md

README.md

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+# fetapi - FeTAp with a Raspberry Pi
+
+```
+
+                                        ,ooFeTApFeTApFeTA%=+-,.
+                                ,+FeTAp+'                      `o,,
+                         ,oFeTAp+                                  `,
+                     ,ooo'                 ,oFeTApFeTAp             o
+                   oo              +FeTAp+'            `oo,          H
+                  o              o'                      X o         l
+              ,@=@+             o          ,,-+*==+-.,    R o      .;
+           ,@=@+  o            o'        ,/   22  11  ``,   E`ooooo'
+          @@*   @@ oo         o'        /  33 , ` ` ,    ;   T
+          @:n   T:@ oo       o         ; 44 ,         .   \  L
+          uM:m  A:K   oFeTAp'          ;55 ,           :   ;  A
+          E:Rn  N:t      F,            | ` :           ;   |   H
+         SC:h    K:o      e,           ` 66 `         , dHHH   C
+        A:Ll      L:s      r,           `  77  `. , . 0  `q/    S
+      ER:a        P:U       n,            \   88  99  00 ,'      L
+     R:Be          i:M       s              `<,,______,-`    sZ, E
+    i:T             E:r       p,                             `sZ B
+    S:K              l:T       r,                                A
+     o:N             H:a        e,                               G
+      t:a           s:c          c,                         ,x+x+'
+        k:T:@:U:M:R:n;             h,             ,p+e+r+a+t/
+          `@:n:M:E:'
+
+```
+
+## Installation
+
+### Installing `linphone-cli` on Raspbian
+
+1. Install `debootstrap`
+
+   ```
+   apt install debootstrap
+   ```
+
+2. Create a *Debian/sid* chroot environment
+
+   ```
+   cd /var/tmp
+   mkdir debian-sid
+
+   debootstrap --arch=armel --foreign --variant=minbase sid ./debian-sid http://ftp.de.debian.org/debian
+
+   chroot debian-sid/ /debootstrap/debootstrap --second-stage
+   ```
+
+3. Install `linphone-cli` inside the chroot environment
+
+   ```
+   chroot debian-sid/ apt -y install linphone-cli
+   ```
+