add description and tags to many examples,

add struct example,
add link to gotools repo in readme.md

Author: SimonWaldherr

advanced/Channel-2.go

@@ -1,3 +1,5 @@
+// Description: Channel example 2
+// Tags: channel, range, for, loop, close, close channel, close ch
 package main
 
 import "fmt"

advanced/advancedimport.go

@@ -1,3 +1,5 @@
+// Description: Advanced import examples
+// Tags: import, package, namespace, alias, dot, underscore
 package main
 
 import (

advanced/aesgcm.go

@@ -1,3 +1,5 @@
+// Description: Encrypt and decrypt a string with AES256 in GCM mode
+// Tags: aes, gcm, encryption, decryption, authenticated encryption, nonce
 package main
 
 import (

advanced/binary_search.go

@@ -1,3 +1,5 @@
+// Description: Binary search algorithm implementation in Go
+// Tags: binary, search, algorithm, slice, array, sort, sorted, sorted array, sorted slice, sorted
 package main
 
 import "fmt"

advanced/bound.go

@@ -1,3 +1,5 @@
+// Description: Find lower and upper bound of a target in a sorted array
+// Tags: binary, search, algorithm, slice, array, sort, sorted, sorted array, sorted slice, sorted
 package main
 
 import "fmt"

advanced/bubble_sort.go

@@ -1,3 +1,5 @@
+// Description: Bubble sort algorithm in Go
+// Tags: bubble, sort, algorithm, slice, array, sort, sorted, sorted array, sorted slice, sorted
 package main
 
 import "fmt"

advanced/channel.go

@@ -1,3 +1,5 @@
+// Description: Channels are useful for communications between multiple go routines, even when the routines are not runned in parallel.
+// Tags: channel, range, for, loop, close, close channel, close ch
 package main
 
 import (

advanced/channel_range.go

@@ -1,3 +1,5 @@
+// Description: Channel range
+// Tags: channel, range, for, loop, close, close channel, close ch
 package main
 
 import "fmt"

advanced/command_line_arguments.go

@@ -1,3 +1,5 @@
+// Description: Command line arguments in Go
+// Tags: command, line, arguments, flag, flag, flag p
 package main
 
 import (

advanced/compress.go

@@ -1,3 +1,5 @@
+// Description: Compress stdin to stdout using gzip
+// Tags: compress, gzip, compress, compress stdin, compress stdout, compress stdin to stdout, compress stdin to stdout using gzip
 package main
 
 import (