Added pid plugin

pid/Makefile

@@ -0,0 +1,11 @@
+all: pid.so
+
+%.so:%.o
+	$(CC) -shared -fpic -lprofanity -o $@ $^
+
+%.o:%.c
+	$(CC) $(INCLUDE) -D_GNU_SOURCE -D_BSD_SOURCE -fpic -O3 -std=c99 \
+        -Wall -Wextra -lprofanity -pedantic -c -o $@ $<
+
+clean:
+	$(RM) pid.so

pid/pid.c

@@ -0,0 +1,22 @@
+#include <stdio.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <profapi.h>
+
+void
+cmd_pid(char **args)
+{
+    pid_t pid = getpid();
+    pid_t ppid = getppid();
+    char buf[50];
+    sprintf(buf, "PID: %d, parent PID: %d", pid, ppid);
+    prof_cons_show(buf);
+    prof_cons_alert();
+}
+
+void
+prof_init(const char * const version, const char * const status)
+{
+    prof_register_command("/pid", 0, 0, "/pid", "Get process ID", "Get process ID", cmd_pid);
+}