Getting Started: Add compilation of standalone application.

To make it easier for newbies to get started, it is shown how
a standalone application can be compiled.

Signed-off-by: Juergen Repp <juergen.repp@sit.fraunhofer.de>

Author: JuergenReppSIT

_posts/2019-02-05-Getting-Started.md

@@ -23,3 +23,49 @@ Check out the [tpm2-tss README] and [tpm2-tss INSTALL] for more information.
 
 [tpm2-tss README]: https://github.com/tpm2-software/tpm2-tss/blob/master/README.md
 [tpm2-tss INSTALL]: https://github.com/tpm2-software/tpm2-tss/blob/master/INSTALL.md
+
+
+After successful installation a standalone application using ESAPI can be compiled as follows:
+
+{% highlight bash %}
+gcc standalone-example.c -L=/usr/local/lib/ -ltss2-esys -o standalone-example
+{% endhighlight %}
+
+Simple example standalone application:
+
+{% highlight c %}
+#include <stdlib.h>
+#include <stdio.h>
+#include <tss2/tss2_esys.h>
+
+int main() {
+
+    TSS2_RC r;
+
+    /* Initialize the ESAPI context */
+    ESYS_CONTEXT *ctx;
+    r = Esys_Initialize(&ctx, NULL, NULL);
+
+        if (r != TSS2_RC_SUCCESS){
+        printf("\nError: Esys_Initializen\n");
+        exit(1);
+    }
+
+    /* Get random data */
+    TPM2B_DIGEST *random_bytes;
+    r = Esys_GetRandom(ctx, ESYS_TR_NONE, ESYS_TR_NONE, ESYS_TR_NONE, 20,
+                       &random_bytes);
+
+    if (r != TSS2_RC_SUCCESS){
+        printf("\nError: Esys_GetRandom\n");
+        exit(1);
+    }
+
+    printf("\n");
+    for (int i = 0; i < random_bytes->size; i++) {
+        printf("0x%x ", random_bytes->buffer[i]);
+    }
+    printf("\n");
+    exit(0);
+}
+{% endhighlight %}