feat: change CI from Travis to github action (TheAlgorithms#262)

Author: imp2002

.github/workflows/build.yml

@@ -0,0 +1,28 @@
+name: build
+
+on: [push, pull_request]
+
+jobs:
+  fmt:
+    name: cargo fmt
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: cargo fmt
+      run: cargo fmt --all -- --check
+   
+  clippy:
+    name: cargo clippy
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: cargo clippy
+      run: cargo clippy --all -- -D warnings
+  
+  test:
+    name: cargo test
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: cargo test
+      run: cargo test

DIRECTORY.md

@@ -8,6 +8,7 @@
     * [Polybius](https://github.com/TheAlgorithms/Rust/blob/master/src/ciphers/polybius.rs)
     * [Rot13](https://github.com/TheAlgorithms/Rust/blob/master/src/ciphers/rot13.rs)
     * [Sha256](https://github.com/TheAlgorithms/Rust/blob/master/src/ciphers/sha256.rs)
+    * [Transposition](https://github.com/TheAlgorithms/Rust/blob/master/src/ciphers/transposition.rs)
     * [Vigenere](https://github.com/TheAlgorithms/Rust/blob/master/src/ciphers/vigenere.rs)
     * [Xor](https://github.com/TheAlgorithms/Rust/blob/master/src/ciphers/xor.rs)
   * Data Structures
@@ -18,6 +19,7 @@
     * [Heap](https://github.com/TheAlgorithms/Rust/blob/master/src/data_structures/heap.rs)
     * [Linked List](https://github.com/TheAlgorithms/Rust/blob/master/src/data_structures/linked_list.rs)
     * [Queue](https://github.com/TheAlgorithms/Rust/blob/master/src/data_structures/queue.rs)
+    * [Stack Using Singly Linked List](https://github.com/TheAlgorithms/Rust/blob/master/src/data_structures/stack_using_singly_linked_list.rs)
     * [Trie](https://github.com/TheAlgorithms/Rust/blob/master/src/data_structures/trie.rs)
   * Dynamic Programming
     * [Coin Change](https://github.com/TheAlgorithms/Rust/blob/master/src/dynamic_programming/coin_change.rs)
@@ -60,9 +62,11 @@
   * Searching
     * [Binary Search](https://github.com/TheAlgorithms/Rust/blob/master/src/searching/binary_search.rs)
     * [Binary Search Recursive](https://github.com/TheAlgorithms/Rust/blob/master/src/searching/binary_search_recursive.rs)
+    * [Kth Smallest](https://github.com/TheAlgorithms/Rust/blob/master/src/searching/kth_smallest.rs)
     * [Linear Search](https://github.com/TheAlgorithms/Rust/blob/master/src/searching/linear_search.rs)
   * Sorting
     * [Bubble Sort](https://github.com/TheAlgorithms/Rust/blob/master/src/sorting/bubble_sort.rs)
+    * [Bucket Sort](https://github.com/TheAlgorithms/Rust/blob/master/src/sorting/bucket_sort.rs)
     * [Cocktail Shaker Sort](https://github.com/TheAlgorithms/Rust/blob/master/src/sorting/cocktail_shaker_sort.rs)
     * [Comb Sort](https://github.com/TheAlgorithms/Rust/blob/master/src/sorting/comb_sort.rs)
     * [Counting Sort](https://github.com/TheAlgorithms/Rust/blob/master/src/sorting/counting_sort.rs)
@@ -77,7 +81,7 @@
     * [Shell Sort](https://github.com/TheAlgorithms/Rust/blob/master/src/sorting/shell_sort.rs)
     * [Stooge Sort](https://github.com/TheAlgorithms/Rust/blob/master/src/sorting/stooge_sort.rs)
   * String
-    * [Aho-Corasick Algorithm](https://github.com/TheAlgorithms/Rust/blob/master/src/string/aho_corasick.rs)
+    * [Aho Corasick](https://github.com/TheAlgorithms/Rust/blob/master/src/string/aho_corasick.rs)
     * [Burrows Wheeler Transform](https://github.com/TheAlgorithms/Rust/blob/master/src/string/burrows_wheeler_transform.rs)
     * [Knuth Morris Pratt](https://github.com/TheAlgorithms/Rust/blob/master/src/string/knuth_morris_pratt.rs)
     * [Manacher](https://github.com/TheAlgorithms/Rust/blob/master/src/string/manacher.rs)