Add user finder.

src/components/user_finder/user_finder.js

@@ -0,0 +1,18 @@
+const UserFinder = {
+  data: () => ({
+    username: undefined
+  }),
+  methods: {
+    findUser (username) {
+      this.$store.state.api.backendInteractor.externalProfile(username)
+        .then((user) => {
+          if (!user.error) {
+            this.$store.commit('addNewUsers', [user])
+            this.$router.push({name: 'user-profile', params: {id: user.id}})
+          }
+        })
+    }
+  }
+}
+
+export default UserFinder

src/components/user_finder/user_finder.vue

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+<template>
+  <div class="user-finder-panel panel panel-default base00-background">
+    <input @keyup.enter="findUser(username)" v-model="username" placeholder="Find user" id="user-finder-input" type="text" />
+  </div>
+</template>
+
+<script src="./user_finder.js"></script>
+
+<style lang="scss">
+ .user-finder-panel {
+   padding: 10px;
+ }
+</style>