Added GitHubFragment with useful quick links

app/src/main/java/com/MartyrPher/smapiandroidinstaller/GitHubFragment.java

@@ -0,0 +1,92 @@
+package com.MartyrPher.smapiandroidinstaller;
+
+import android.content.Intent;
+import android.net.Uri;
+import android.os.Bundle;
+import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
+import android.support.v4.app.Fragment;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.Button;
+import android.widget.Toast;
+
+public class GitHubFragment extends Fragment
+{
+    //GitHub releases link constant
+    private final String mGitHubLink = "https://github.com/MartyrPher/SMAPI-Android-Installer/releases/latest";
+
+    //Mod Compatibility link constant
+    private final String mCompatLink = "https://smapi.io/mods/";
+
+    //Stardew Valley nexus home link constant
+    private final String mNexusLink = "https://www.nexusmods.com/stardewvalley";
+
+    /**
+     * Override that gets called when the view needs to be created
+     * @param inflater = The layout inflator
+     * @param container = The container to inflate the view
+     * @param savedInstanceState = The savedInstanceState
+     * @return the inflated view/layout
+     */
+    @Override
+    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
+    {
+        //Inflate the fragment layout
+        return inflater.inflate(R.layout.github_layout, container, false);
+    }
+
+    /**
+     * Override that gets called when the view is created, used to setup the buttons
+     * @param view = The view that was created
+     * @param savedInstanceState = The savedInstanceState
+     */
+    @Override
+    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState)
+    {
+        //Set up the github button onClick
+        final Button github_button = view.findViewById(R.id.github_button);
+        github_button.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                openLink(mGitHubLink);
+            }
+        });
+
+        //Set up the compat button onClick
+        final Button compat_button = view.findViewById(R.id.compat_button);
+        compat_button.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                openLink(mCompatLink);
+            }
+        });
+
+        //Set up the nexus button onClick
+        final Button nexus_button = view.findViewById(R.id.nexus_button);
+        nexus_button.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                openLink(mNexusLink);
+            }
+        });
+    }
+
+    /**
+     * Opens a link in the default browser on Android
+     * @param url = The url to open in the browser
+     */
+    private void openLink(String url)
+    {
+        try {
+            Intent openBrowser = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
+            startActivity(openBrowser);
+        }
+        catch (Exception e)
+        {
+            Toast.makeText(getContext(), "Could not find a web browser to open the link.", Toast.LENGTH_LONG).show();
+        }
+    }
+}
+